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Organic Chemistry – Some Basic Principles and Techniques · Question 37

JEE Main 2025 (Online) 28th January Morning ShiftMCQEasy📈 Topic in 10% papers+4−1
1

The correct order of stability of following carbocations is : [figure]

  1. A > B > C > D
  2. C > B > A > D
  3. B > C > A > D
  4. C > A > B > D

Answer

(4) C > A > B > D

Solution

C is the tropylium (cycloheptatrienyl) cation: planar, cyclic, 6π electrons (4n + 2, n = 1) aromatic; the positive charge is spread over all seven carbons most stable.

A ( Ph3C ): the charge is delocalised into three benzene rings.

B ( Ph2CH ): delocalised into only two rings A > B.

D (sec-butyl cation): a 2° alkyl carbocation stabilised only by +I effect and hyperconjugation least stable.

C > A > B > D

Answer: (4)

JEE Main 2025 (Online) 28th January Morning Shift

Keep practising — Organic Chemistry – Some Basic Principles and Techniques

2

The major product of which of the following reaction is not obtained by rearrangement reaction ?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2026 (Online) 8th April Evening Shift
3

The total number of aromatic compounds/species from the following is [figure]

  1. 6
  2. 4
  3. 3
  4. 5
JEE Main 2026 (Online) 8th April Evening Shift
4

Shown below is the structure of methyl acetate with three different α, β and γ carbon - oxygen bonds. [figure] The correct order of bond lengths of these bonds is :

  1. α > β > γ
  2. α < β < γ
  3. α = β = γ
  4. α < β = γ
JEE Main 2026 (Online) 6th April Evening Shift
5

Given below are two statements : In the light of the above statements, choose the correct 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
JEE Main 2026 (Online) 5th April Morning Shift
6

IUPAC name of the some alkenes are given below. Find out the correct stability order. Choose the correct answer from the options given below :

  1. C > A > B > D
  2. C > A > D > B
  3. B > D > A > C
  4. A > B > C > D
JEE Main 2026 (Online) 5th April Evening Shift
7

Identify the correct IUPAC name of hydrocarbon (x) containing three primary carbon atoms and with molar mass 72 g mol-1.

  1. 1, 1 - Dimethylcyclopropane
  2. 2, 2 - Dimethylpropane
  3. 2 - Methylbutane
  4. n-pentane
JEE Main 2026 (Online) 5th April Evening Shift
8

Increasing order of electron withdrawing power of following functional groups is : a. -CN b. -COOH c. -NO2 d. -I

  1. c < b < d < a
  2. c < a < b < d
  3. d < b < a < c
  4. a < b < c < d
JEE Main 2026 (Online) 4th April Morning Shift
9

Match the LIST-I with LIST-II Choose the correct answer from the options given below:

  1. A-III, B-I, C-II, D-IV
  2. A-III, B-IV, C-II, D-I
  3. A-III, B-IV, C-I, D-II
  4. A-I, B-III, C-IV, D-II
JEE Main 2026 (Online) 4th April Evening Shift
10

Consider the following molecules/species : [figure] The correct order of carbon-oxygen double bond length is :

  1. x > y > z
  2. y > z > x
  3. z > x > y
  4. x > z > y
JEE Main 2026 (Online) 4th April Evening Shift
11

The descending order of acidity among the following compounds is : [figure] Choose the correct answer from the options given below :

  1. B > D > E > A > C
  2. D > B > E > A > C
  3. C > A > B > D > E
  4. D > E > B > A > C
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