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Aldehydes, Ketones and Carboxylic Acids · Question 17

NEET (UG) 2022MCQEasy📈 Topic in 50% papers+4−1
1

RMgX + CO2 [ether]dry Y H3O+ RCOOH What is Y in the above reaction?

  1. RCOO-Mg+X
  2. R3CO-Mg+X
  3. RCOO-X+
  4. (RCOO)2Mg

Answer

(1) RCOO-Mg+X

Solution

As per NCERT, Grignard reagents add to carbon dioxide (dry ice) to form salts of carboxylic acids, which on acidification give the acid:

R-MgX + O=C=O dry ether R-COO-Mg+X

R-COO-Mg+X H3O+ RCOOH + Mg(OH)X

∴ Y is the halomagnesium carboxylate RCOO-Mg+X.

Answer: (1)

NEET (UG) 2022

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

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

  1. (a) - (iii), (b) - (iv), (c) - (ii), (d) - (i)
  2. (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)
  3. (a) - (i), (b) - (iii), (c) - (ii), (d) - (iv)
  4. (a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
NEET (UG) 2022
3

Which one of the following is not formed when acetone reacts with 2-pentanone in the presence of dilute NaOH followed by heating?

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

Which of the following reactions is not an example for nucleophilic addition-elimination reaction?

  1. CH3CHO + NH3 CH3CH=NH + H2O
  2. CH3CHO + NaHSO3 CH3- H | OH |C-SO3Na
  3. CH3CHO + NH2OH CH3CH=N-OH + H2O
  4. CH3CHO + C6H5NHNH2 CH3CH=N-NHC6H5 + H2O
NEET (UG) 2022 (Phase 2)
5

The product formed from the following reaction sequence is [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2022 (Phase 2)
6

The products A and B in the following reaction sequence are : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2022 (Phase 2)
7

The incorrect method to synthesize benzaldehyde is

  1. [figure] , CH3MgBr, followed by H3O+
  2. [figure] , H2, Pd-BaSO4
  3. [figure] , DIBAL-H, followed by H2O
  4. [figure] , CrO2Cl2 in CS2, followed by H3O+
NEET (UG) 2022 (Phase 2)
8

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

  1. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
  2. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
  3. (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
  4. (a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
NEET (UG) 2021
9

The intermediate compound 'X' in the following chemical reaction is : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2021
10

The product formed in the following chemical reaction is : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2021
11

Identify compound X in the following sequence of reactions : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2020

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