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Aldehydes, Ketones and Carboxylic Acids

NEET (UG) 2025MCQEasy📈 Topic in 50% papers+4−1
Ques. 1NEET (UG) 2025

Identify the suitable reagent for the following conversion. [figure]

  1. (i) NaBH4, (ii) H+/H2O
  2. H2/Pd-BaSO4
  3. (i) LiAlH4, (ii) H+/H2O
  4. (i) AlH(iBu)2, (ii) H2O

Answer

(4) (i) AlH(iBu)2, (ii) H2O

Solution

As per NCERT, esters are reduced to aldehydes by diisobutylaluminium hydride (DIBAL-H, AlH(iBu)2) followed by hydrolysis; the reaction stops at the aldehyde stage:

C6H5COOCH3 [(ii) H2O](i) AlH(iBu)2 C6H5CHO + CH3OH

(1) NaBH4 does not reduce esters.

(2) H2/Pd-BaSO4 (Rosenmund reduction) reduces acid chlorides, not esters.

(3) LiAlH4 reduces the ester completely to the primary alcohol, C6H5CH2OH.

Answer: (4)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2NEET (UG) 2025

The correct order of decreasing acidity of the following aliphatic acids is

  1. HCOOH > CH3COOH > (CH3)2CHCOOH > (CH3)3CCOOH
  2. HCOOH > (CH3)3CCOOH > (CH3)2CHCOOH > CH3COOH
  3. (CH3)3CCOOH > (CH3)2CHCOOH > CH3COOH > HCOOH
  4. CH3COOH > (CH3)2CHCOOH > (CH3)3CCOOH > HCOOH
Ques. 3NEET (UG) 2025

The major product of the following reaction is [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 4NEET (UG) 2024

Identify the correct reagents that would bring about the following transformation. [figure]

  1. (i) H2O/H+, (ii) CrO3
  2. (i) BH3, (ii) H2O2/OH , (iii) PCC
  3. (i) BH3, (ii) H2O2/OH , (iii) alk. KMnO4
  4. (i) H2O/H+, (ii) PCC
Ques. 5NEET (UG) 2024

Fehling's solution 'A' is

  1. aqueous copper sulphate
  2. alkaline copper sulphate
  3. alkaline solution of sodium potassium tartrate (Rochelle's salt)
  4. aqueous sodium citrate
Ques. 6NEET (UG) 2024

Match List I with List II. Choose the correct answer from the options given below:

  1. A-IV, B-I, C-III, D-II
  2. A-III, B-I, C-II, D-IV
  3. A-IV, B-I, C-II, D-III
  4. A-I, B-IV, C-II, D-III
Ques. 7RE-NEET (UG) 2024

Select the incorrect reaction among the following :

  1. CH3COCl [ ]H2O CH3COOH
  2. [figure]
  3. CH3CH2OH [(ii) H3O ](i) KMnO4/OH- CH3COOH
  4. CH3CH2CH2OH CrO3-H2SO4 CH3CH2COOH
Ques. 8NEET (UG) 2023

Identify product (A) in the following reaction : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 9NEET (UG) 2023

Complete the following reaction: [figure] [C] is .

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10NEET (UG) 2023

Identify the major product obtained in the following reaction: [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 11NEET (UG) 2022

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below

  1. Both Statement I and Statement II are correct
  2. Both Statement I and Statement II are incorrect
  3. Statement I is correct but Statement II is incorrect
  4. Statement I is incorrect but Statement II is correct

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