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Aldehydes, Ketones and Carboxylic Acids

RE-NEET (UG) 2026MCQMedium📈 Topic in 12% papers+4−1
Ques. 1RE-NEET (UG) 2026

For the following reaction sequence, choose the correct option [figure]

  1. Both P and Q are carbonyl compounds
  2. If P is the sodium salt of a carboxylic acid, Q is a primary alcohol
  3. P and Q are aromatic compounds
  4. If P gives a carboxylic acid on acidification, Q gives a poisonous gas on exposure to air and light

Answer

(4) If P gives a carboxylic acid on acidification, Q gives a poisonous gas on exposure to air and light

Solution

1. Benzene undergoes Friedel-Crafts acylation with CH3COCl / AlCl3 to give acetophenone (C6H5COCH3).

2. Haloform reaction of acetophenone with NaOCl gives sodium benzoate (P, C6H5COONa) and chloroform (Q, CHCl3).

3. On acidification, P yields benzoic acid (a carboxylic acid).

4. Chloroform (Q) is slowly oxidised by air in the presence of light to form phosgene (COCl2), an extremely poisonous gas:

2CHCl3 + O2 h 2COCl2 + 2HCl. Answer: (4)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2NEET (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
Ques. 3NEET (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. 4NEET (UG) 2025

The major product of the following reaction is [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 5NEET (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. 6NEET (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. 7NEET (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. 8RE-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. 9NEET (UG) 2023

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

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

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 11NEET (UG) 2023

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

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

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