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Aldehydes, Ketones and Carboxylic Acids · Question 5

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

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)

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2

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
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3

The major product of the following reaction is [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
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4

Match List-I with List-II and choose the correct option.

  1. A-II, B-IV, C-I, D-III
  2. A-I, B-II, C-III, D-IV
  3. A-IV, B-III, C-II, D-I
  4. A-II, B-I, C-IV, D-III
NEET (UG) 2024
5

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
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6

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
NEET (UG) 2024
7

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
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8

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
RE-NEET (UG) 2024
9

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

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

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
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11

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

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

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