NEET Previous Year Questions (2014-21): Aldehydes, Ketones & Carboxylic Acids Notes | Study Chemistry Class 12 - NEET
Document Description: NEET Previous Year Questions (2014-21): Aldehydes, Ketones & Carboxylic Acids for NEET 2022 is part of Aldehydes, Ketones and Carboxylic Acids for Chemistry Class 12 preparation. The notes and questions for NEET Previous Year Questions (2014-21): Aldehydes, Ketones & Carboxylic Acids have been prepared according to the NEET exam syllabus. Information about NEET Previous Year Questions (2014-21): Aldehydes, Ketones & Carboxylic Acids covers topics like and NEET Previous Year Questions (2014-21): Aldehydes, Ketones & Carboxylic Acids Example, for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for NEET Previous Year Questions (2014-21): Aldehydes, Ketones & Carboxylic Acids.
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Q.1.
Consider the above reaction and identify the missing reagent/chemical. (2021)
A: CaO
B: DIBAL-H
C: B2H6
D: Red Phosphorus
Ans: A
Solution:
Decarboxylation takes place by soda-lime (NaOH + CaO)
Q.2. Match List-I with List-II. (2021)
Choose 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:
Q.3. The product formed in the following chemical reaction is : (2021)
A: 
B: 
C: 
D: 
Ans: B
Solution:
NaBH4 reduces aldehyde/ketone but does not reduce ester.
Q.4. The intermediate compound 'X' in the following chemical reaction is : (2021)
A:
B:
C:
D:
Ans: C
Solution:
Q.5. Identify compound X in the following sequences of reactions : (2020)
A:
B:
C:
D:
Ans: A
Solution:
Q.6. 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:
Two different carbonyl compound is treated with base known as cross-aldol condensation.
Q.7. The major product of the following reaction is: (2019)
A:
B:
C:
D:
Ans: B
Solution:
Q.8. 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.
Q.9. 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:
B:
C:
D:
Ans: C
Solution:
Haloform reaction is shown by compound having
Q.10. Consider the reactions :- (2017)
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:
Q.11. Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating ?:- (2017)
A:
B:
C:
D:
Ans: A
Solution:
Q.12. 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:
Q.13. 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:
trans-isomer does not react with acetone.
Q.14. 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.15. Treatment of cyclopentanone
with methyl lithium gives which of the following species ? (2015)
A: Cyclopentanonyl biradical
B: Cyclopentanonyl anion
C: Cyclopentanonyl cation
D: Cyclopentanonyl radical
Ans: B
Solution:
Q.16. 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
Negative Tollens' test ⇒ ketone
Hence, the compound is 3-pentanone
Q.17. Which one is most reactive towards Nucleophilic addition reaction ? (2014)
A:
B:
C:
D:
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).
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