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Organic Chemistry – Some Basic Principles and Techniques

JEE Main 2025 (Online) 22nd January Evening ShiftMCQEasy📈 Topic in 13% papers+4−1
Ques. 1JEE Main 2025, 22 January (Evening Shift)

The most stable carbocation from the following is :

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

Answer

(3) [figure]

Solution

A benzylic cation is stabilised by the ring; a +M group at para adds one more resonance form:

[figure] [figure]

–OMe at meta cannot conjugate (only –I); CH3 gives only +I.

∴ (C) > (B) > (D) > (A)

Answer: (3)

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Ques. 2JEE Main 2025, 22 January (Evening Shift)

The alkane from below having two secondary hydrogens is :

  1. 2,2,4,5-Tetramethylheptane
  2. 2,2,4,4-Tetramethylhexane
  3. 4-Ethyl-3,4-dimethyloctane
  4. 2,2,3,3-Tetramethylpentane

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