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Aldehydes, Ketones and Carboxylic Acids · Question 2

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

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)

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2

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

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

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
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4

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
NEET (UG) 2025
5

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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6

The major product of the following reaction is [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
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7

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
8

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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9

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
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10

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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11

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
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