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Haloalkanes and Haloarenes · Question 22

JEE Main 2025 (Online) 29th January Morning ShiftMCQMedium📈 Topic in 13% papers+4−1
1

In the following substitution reaction : [figure] Product 'P' formed is :

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

Answer

(4) [figure]

Solution

C2H5O- (from C2H5ONa) replaces Br by nucleophilic aromatic substitution (addition–elimination).

As per NCERT, an electron-withdrawing -NO2 group at the ortho/para position stabilises the negatively charged intermediate (the negative charge is delocalised onto the -NO2 group), so that halogen is replaced.

Br at C-1 (top) is para to -NO2 replaced by -OC2H5.

Br at C-2 is meta to -NO2 the charge cannot reach -NO2; it is not replaced.

P = 2-bromo-1-ethoxy-4-nitrobenzene:

[figure]

Answer: (4)

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2

The products A and B in the following reactions, respectively are A AgNO2 CH3-CH2-CH2-Br AgCN B

  1. CH3-CH2-CH2-ONO, CH3-CH2-CH2-CN
  2. CH3-CH2-CH2-NO2, CH3-CH2-CH2-CN
  3. CH3-CH2-CH2-ONO, CH3-CH2-CH2-NC
  4. CH3-CH2-CH2-NO2, CH3-CH2-CH2-NC
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3

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

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 28th January Evening Shift
5

The major product of the following reaction is: [figure]

  1. 6-Phenylhepta-3,5-diene
  2. 6-Phenylhepta-2,4-diene
  3. 2-Phenylhepta-2,4-diene
  4. 2-Phenylhepta-2,5-diene
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