JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

JEE: JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

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Q.1. What is the product of following reaction?    (2020)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(4)
The reaction involved is
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.2. The predominant intermolecular forces present in ethyl acetate, a liquid, are    (2020)
(1) London dispersion and dipole-dipole
(2) Hydrogen bonding and London dispersion
(3) Dipole-dipole and hydrogen bonding
(4) London dispersion, dipole-dipole and hydrogen bonding
Ans.
(1)
There are two type of forces exist in ethyl acetate a liquid. First is London dispersion forces between the hydrocarbon part of the molecule and second is dipole-dipole interaction between carbonyl carbon and oxygen of one molecule with another molecule.
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.3. The most suitable reagent for the given conversion is    (2020)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) B2H6
(2) NaBH4
(3) LiAlH4
(4) H2/Pd
Ans.
(1)
The reaction involved is
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.4. The major product in the following reaction is    (2020)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(4)
The reaction involved is
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.5. An unsaturated hydrocarbon X absorbs two hydrogen molecules on catalytic hydrogenation, and also gives following reaction
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
X will be    (2020)
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(3)
By back tracking the reaction, the aldehyde which on reaction with Tollens’ reagent gives 3-oxohexanedicarboxylic acid is
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Above product is obtained by the ozonolysis of compound given in option (3), that is,
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
The above compound can above two molecules of hydrogen to give cycloalkane.
Thus, the reaction involved is
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.6. Identify (A) in the following reaction sequence:    (2020)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(2)
Solution.
The reaction involved is
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.7. Consider the following reactions    (2020)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
The mass percentage of carbon in A is________.
Ans.
(66.67)
The reaction involved is
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
The molecular formula of A is C4H8O.
The molar mass of A = 72.0 g mL–1
Mass percentage of C JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.8. The major product of following reaction is:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) RCOOH
(2) RCONH2
(3) RCHO
(4) RCH2NH2
Ans.
(3)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
The reduction of nitriles to aldehydes can be done using DIBAL-H.

Q.9. The major product formed in the following reaction is:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(3)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.10. The tests performed on compound X and their inferences are:
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Compound ‘X’ is:    (2019)
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(2)
2, 4 DNP test is given by aldehydes and ketones
lodoform test is given by
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Azo dye test not given by
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.11. JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(4)
NaBH4 is a selective reducing agent, used for the reduction of aldehydes and ketones, it does not affect alkene and ester.
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.12. The major product of the following reaction is:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(4)
Reaction involved:
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.13. The major product obtained in the following reaction is:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans. 
(4)
Reaction involved:
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.14. The major product of the following reaction is:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(4)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.15. The major product of the following reaction is:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans. 
(3)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.16. The major product of the following reaction is:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(3)
DIBAL-H will reduce cyanides and esters to aldehydes.
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.17. JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE cannot be prepared by:    (2019)
(1) CH3CH2COCH+ PhMgX
(2) PhCOCH2CH3 + CH3MgX
(3) PhCOCH3 + CH3CH2MgX
(4) HCHO+PhCH(CH3)CH2MgX
Ans. 
(4)
Tertiary alcohol is prepared by the reaction of Grignard reagent with a ketone (formaldehyde is used to prepare primary alcohol).
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEEJEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.18. In the following reaction    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
The best combination is:
(1) CH3CHO and tBuOH
(2) HCHO and MeOH
(3) CH3CHO and MeOH
(4) HCHO and tBuOH
Ans.
(2)
Best combination is HCHO (more reactive aldehyde) and MeOH (less stericallv hindered alcohol).
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.19. In the following reactions, products A and B are:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(1)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.20. The major product of the following reaction is:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans. 
(2)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
NaBH4 does not reduce the double bond but can reduce keto group JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.21. The aldehydes which will not form Grignard product with one equivalent Grignard reagents are:    (2019)
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) (B), (D)
(2) (B), (C)
(3) (B), (C), (D)
(4) (C), (D)
Ans. 
(1)
Grignard reagent will not react with aldehydes if it has a functional group which contains acidic hydrogen. Thus options (B) and (D) have—COOH and—CH2OH respectively which contain acidic H-atom. Therefore, acid-base reaction occurs.
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.22. An organic compound neither reacts with neutral ferric chloride solution nor with Fehling solution. It however, reacts with Grignard reagent and gives positive iodoform test. The compound is:    (2019)
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(4)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.23. The major product of the following reaction is:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(4)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.24. The major product obtained in the following reaction is:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans. 
(2)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.25. In the following reaction
Carbonyl compound + JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Rate of the reaction is the highest for:    (2019)
(1) Acetone as substrate and methanol in excess.
(2) Propanal as substrate and methanol in stoichiometric amount.
(3) Propanal as substrate and methanol in excess.
(4) Acetone as substrate and methanol in stoichiometric amount.
Ans.
(3)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Generally, aldehydes are more reactive than ketones in nucleophilic addition reactions.
∴ Rate of reaction with alcohol to form acetal and ketal is
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.26. Major products of the following reaction are:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) CH3OH and HCO2H
Ans. 
(3)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE 
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.27. Compound A(C9H10O) shows positive iodoform test. Oxidation of A with MnO4/KOH gives acid B(C8H6O4). Anhydride of B is used for the preparation of phenolphthalein. Compound A is:    (2019)
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans. 
(4)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE 

Q.28. Which dicarboxylic acid in presence of a dehydrating agent is least reactive to give an anhydride?    (2019)
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(1)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Adipic acid does not form anhydride.

Q.29. The decreasing order of ease of alkaline hydrolysis for the following esters is    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE 
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) III > II > IV > I
(2) III > II > I > IV
(3) IV > II > III > I
(4) II > III > I > IV
Ans.
(2)
Rate of reaction ∝ Electrophilicity of carbonyl carbon, so, E.W.G. increases rate while E.R.G. decreases the rate.
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.30. The major product of the following reaction is:    (2019)
CH3CH = CHCO2CH3 JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) CH3CH2CH2CO2CH3
(2) CH3CH = CHCH2OH
(3) CH3CH2CH2CH2OH
(4) CH3CH2CH2CHO
Ans.
(2)
LiAlH4 reduces esters to alcohols but does not reduce C = C.
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.31. The major product of the following reaction is:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(1)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Acid catalysed intramolecular esterification reaction.
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.32. The major product of the following reaction is:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3)JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(2)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.33. The major product ‘Y’ in the following reaction is:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans. 
(1)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.34. The major product of the following reaction is:    (2019)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(2)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE 

Q.35. The main reduction product of the following compound with NaBH4 in methanol is:    (2018)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(1)
Sodium borohydride will reduce ketone to alcohol. It will not reduce amide group and C = C double bond.
Hence, option (1) is the correct answer.

Q.36. The reagent(s) required for the following conversion are:    (2018)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) (i)LiAlH4 (ii) H3 O+ 
(2) (i) B2 H6 (ii) SnCl2/HCl  (iii) H3O+ 
(3) (i)B2H6  (ii)DIBAL-H (iii)H3O+ 
(4) (i)NaBH4 (ii)Raney Ni/H2 (iii)H3O+ 
Ans.
(3)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.37. The major product B formed in the following reaction sequence is:   (2018)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(4)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEEJEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.38. The correct sequence of reagents for the following conversion will be    (2017)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) [Ag(NH3)2]+OH-, H+/CH3OH, CH3MgBr 
(2) CH3MgBr, H+/CH3OH, [Ag(NH3)2]+OH- 
(3) CH3MgBr, [Ag(NH3)2]+OH-, H+/CH3OH 
(4) [Ag(NH3)2]+OH-, CH3MgBr, H+/CH3OH 
Ans.
(1)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.39. The major product obtained in the following reaction is    (2017)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans. (2) 
DIBAL — H reduces esters and carboxylic acids into aldehydes 
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.40. A compound of molecular formula C8H8O2 reacts with acetophenone to form a single cross-aldol product in the presence of base. The same compound on reaction with conc. NaOH forms bezyl alcohol as one of the products. The structure of the compound is:    (2017)
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(1)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE 
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.41. The reaction of propene with HOCl (Cl2 + H2O) proceeds through the intermediate:    (2016) 
(1) CH3 - CH+ - CH2 - OH 
(2) CH3 - CH+ - CH2 - Cl 
(3) CH3 - CH(OH) - CH+2 
(4) CH3 - CHCl - CH+2 
Ans.
(2)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.42. The correct statement about the synthesis of erythritol (C(CH2OH)4) used in the preparation of PETN is:    (2016)
(1) The synthesis requires two aldol condensations and two Cannizzaro reactions.
(2) Alpha hydrogens of ethanol and methanol are involved in this reaction.
(3) The synthesis requires four aldol condensations between methanol and ethanol.
(4) The synthesis requires three aldol condensations and one Cannizzaro reaction.
Ans.
(4)
The synthesis requires three aldol & one cannizzaro reaction.
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE

Q.43. Consider the reaction sequence below:    (2016)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(1) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(2) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(3) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
(4) JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE
Ans.
(4)
JEE Main Previous year questions (2016-20): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry for JEE - JEE 

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