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NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12 PDF Download

Q.1. Identify product (A) in the following reaction:     (2023)
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12A: NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
B: NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
C: NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
D: NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
Ans: 
A
Solution: This reaction is Clemmensen reduction
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12

Q.2. Identify the major product obtained in the following reaction:      (2023)
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 123 – OH NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12 major product
A: NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
B: NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
C: NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
D: NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
Ans: 
C
Solution:
Ammoniacal silver nitrate solution is Tollens’ reagent. Tollens’ reagent can be used to distinguish aldehyde & ketone as aldehyde upon warming with Tollens’ reagent produces a silver mirror due to formation of silver metal in alkaline medium. Aldehyde is oxidised to corresponding carboxylate anion.
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12


Q.3. NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
What is Y in the above reaction?    (2022)
A: RCOO-X+ 
B: (RCOO)2Mg
C: RCOO-Mg+X
D: R3CO-Mg+X
Ans:
C
Solution:
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12

Q.4. Given below are two statements:  
Statement I: The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole-dipole interactions.  
Statement II: The boiling points of aldehydes and ketones are lower than the alcohols of similar molecular masses due to the absence of H-bonding.
In the light of the above statements, choose the most appropriate answer from the options given below:    (2022)
A: Statement I is correct but Statement II is incorrect.  
B: Statement I is incorrect but Statement II is correct.
C: Both Statement I and Statement II are correct.
D: Both Statement I and Statement II are incorrect.
Ans: 
C
Solution:
The boiling points of aldehydes and ketones are comparatively higher than those of hydrocarbons of comparable molecular mass due to appreciable intermolecular attraction (dipole-dipole) between the opposite ends of NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
 The boiling point of aldehyde and ketones are lower than corresponding alcohols of comparable molecular mass due to absence of the H-bonding.

Q.5. Match List-I with List -II.
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12from the options given below correct answer Choose the    (2022)

A: (a) – (i), (b) – (iii), (c) – (ii), (d) – (iv)
B: (a) – (iv), (b) – (iii), (c) – (ii), (d) – (i)
C: (a) – (iii), (b) – (iv), (c) – (ii), (d) – (i)
D: (a) – (ii), (b) – (iii), (c) – (iv), (d) – (i)
Ans:
B
Solution:
Cyanohydrin → HCN
Acetal → Alcohol
Schiff's base → R–NH2
Oxime → NH2–OH

Q.6. Which one of the following is not formed when acetone reacts with 2-pentanone in the presence of dilute NaOH followed by heating?    (2022)
A: NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
B: NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
C: NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
D: NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
Ans:
D
Solution:
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12


Q.7.
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
Consider the above reaction and identify the missing reagent/chemical.     (2021)
A: CaO
B: DIBAL-H

C: B2H6
D: Red Phosphorus
Ans: 
A
Solution:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
Decarboxylation takes place by soda-lime (NaOH + CaO)

Q.8. Match List-I with List-II.     (2021)
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12Choose the correct answer from the options given below.
A: (a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
B: (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
C: 
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
D: (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
Ans: 
B
Solution:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12

Q.9. The product formed in the following chemical reaction is :     (2021)
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12 
A:  NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12

B:  NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
C: NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
D: NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12 
Ans: B
Solution:
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
NaBH4 reduces aldehyde/ketone but does not reduce ester.

Q.10. The intermediate compound 'X' in the following chemical reaction is :     (2021)
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
A:NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
B:NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
C:NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
D:NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
Ans: C
Solution:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12

Q.11. Identify compound X in the following sequences of reactions :     (2020)
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
A:
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
B:
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
C:
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
D:
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12

Ans: A
Solution:
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12

Q.12. Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as:      (2020)
A: Cross Cannizzaro’s reaction
B: Cross Aldol condensation 
C: Aldol condensation 
D: Cannizzaro’s reaction
Ans: B
Solution:
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
Two different carbonyl compound is treated with base known as cross-aldol condensation.

Q.13. The major product of the following reaction is:    (2019)
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
A:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
B:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
C:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
D:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
Ans: 
B
Solution:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12

Q.14. Carboxylic acid have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their     (2018)
A: formation of intramolecular H-bonding
B: formation of carboxylate ion
C: more extensive association of carboxylic acid via vander Wall force of attraction
D: formation of intermolecular H-bonding.
Ans: 
D
Solution:

Carboxylic acid has higher boiling point than aldehyde, ketone and even alcohols of comparable molecular mass. This is due to more extensive association through intermolecular H-bonding.
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12

Q.15. Compound A, C8H10O, is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell. A and Y are respectively     (2018)
A:NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
B:NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
C:NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
D:NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
Ans: 
C
Solution:
Haloform reaction is shown by compound having
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12

Q.16. Consider the reactions :-    (2017)

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
A: A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide.
B: A-Ethanal, X-Ethanol, Y-But-2-enal , Z-Semicarbazone
C: A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone
D: A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-hydrazine
Ans: 
B
Solution:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12

Q.17. Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating ?:-    (2017)
A:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
B:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
C:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
D:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
Ans: 
A
Solution:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12

Q.18. The product formed by the reaction of an aldehyde with a primary amine is :    (2016)
A: Aromatic acid
B: Schiff base
C: Ketone
D: Carboxylic acid
Ans: 
B
Solution:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12

Q.19. Which of the following reagents would distinguish cis-cyclopenta-1,2- diol from the trans-isomer?    (2016)
A: Aluminium isopropoxide
B: Acetone
C: Ozone
D: MnO2
Ans: 
B
Solution:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
trans-isomer does not react with acetone.

Q.20. The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha-carbon, is :    (2016)
A: a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this processes is known as keto-enol tautomerism .
B: a carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol.
C: a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.
D: a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known a carbonylation.
Ans: 
A
Solution:

It is known that basic need for the existance of Keto-enol tautomers is the presence of at least one hydrogen atom at adjacent sp3 carbon of carbonyl carbon.

Q.21. Treatment of cyclopentanoneNEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12with methyl lithium gives which of the following species?    (2015)
A: Cyclopentanonyl biradical
B: Cyclopentanonyl anion
C: Cyclopentanonyl cation
D: Cyclopentanonyl radical
Ans: 
B
Solution:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12

Q.22. An organic compound X having molecular formula C5H10O yields phenyl hydrazone and gives negative response to the iodoform test and tollen test. It produces n-pentane on reduction X could be    (2015)
A: n-amyl alcohol
B: pentanal
C: 2-pentanone
D: 3-pentanone
Ans: 
D
Solution:

Compound 'X' yields phenylhydrazone
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
Negative Tollens' test ⇒ ketone
Hence, the compound is 3-pentanone
NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12

Q.23. Which one is most reactive towards Nucleophilic addition reaction?    (2014)
A:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
B:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
C:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
D:

NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12
Ans: B
Solution:

Aldehydes are more reactive than ketone towards nucleophillic addition reaction. Among aldehydes the one having electron withdrawing (−M) group is more reactive than that of electron supplying group(+M).

The document NEET Previous Year Questions (2014-2023): Aldehydes, Ketones & Carboxylic Acids | Chemistry Class 12 is a part of the NEET Course Chemistry Class 12.
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