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Aldehydes, Ketones and Carboxylic Acids · Question 13

NEET (UG) 2023MCQEasy📈 Topic in 12% papers+4−1
1

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

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

Answer

(4) [figure]

Solution

Zinc amalgam and concentrated HCl (Clemmensen reduction) reduce the carbonyl group of aldehydes and ketones to CH2:

>C=O Zn-Hg/conc. HCl >CH2 + H2O

Both acetyl groups (-COCH3) become ethyl groups (-CH2CH3), releasing 2H2O; the rings are not affected. Product (A) is the diethyl compound in option (4).

Answer: (4)

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2

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

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

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

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

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below

  1. Both Statement I and Statement II are correct
  2. Both Statement I and Statement II are incorrect
  3. Statement I is correct but Statement II is incorrect
  4. Statement I is incorrect but Statement II is correct
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5

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
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6

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)
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7

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]
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8

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
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9

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
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10

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

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

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+
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