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Aldehydes, Ketones and Carboxylic Acids

RE-NEET (UG) 2026MCQEasy📈 Topic in 50% papers+4−1
Ques. 1RE-NEET (UG) 2026

Consider the following reaction, and choose the correct option. [figure]

  1. Compound P is obtained by the hydrogenation of benzoyl chloride with Pd on BaSO4
  2. On treating compound P with saturated NaHCO3 solution, brisk effervescence is observed
  3. Compound P can be prepared by treating benzene with anhydrous AlCl3 and CH3COCl
  4. On treating with bromine water, compound P gives a white precipitate

Answer

(1) Compound P is obtained by the hydrogenation of benzoyl chloride with Pd on BaSO4

Solution

In the Étard reaction, oxidation of toluene with chromyl chloride (CrO2Cl2) in CS2 followed by hydrolysis yields benzaldehyde as compound P:

C6H5CH3 [ii. H3O+]i. CrO2Cl2, CS2 C6H5CHO (P)

Rosenmund reduction of benzoyl chloride with H2/Pd-BaSO4 also yields benzaldehyde:

C6H5COCl + H2 Pd/BaSO4 C6H5CHO + HCl

Therefore, compound P is obtained by the hydrogenation of benzoyl chloride with Pd on BaSO4.

Answer: (1)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2RE-NEET (UG) 2026

The compound that CANNOT be obtained from the aldol condensation reaction shown below, is [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 3RE-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
Ques. 4NEET (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. 5NEET (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. 6NEET (UG) 2025

The major product of the following reaction is [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 7NEET (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. 8NEET (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. 9NEET (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. 10RE-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. 11NEET (UG) 2023

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

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

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