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Organic Chemistry – Some Basic Principles and Techniques

JEE Main 2025 (Online) 22nd January Evening ShiftMCQEasy📈 Topic in 5% papers+4−1
Ques. 1JEE 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

Answer

(4) 2,2,3,3-Tetramethylpentane

Solution

Secondary (2°) H = H on a CH2 that is joined to two carbons. Two 2° H ⇒ exactly one CH2 in the molecule.

(1) [figure]

(1): two CH2 ⇒ (1) has 4 secondary H

(2) [figure]

(2): two CH2 ⇒ (2) has 4 secondary H

(3) [figure]

(3): four CH2 in the chain + one in C2H5 ⇒ (3) has 10 secondary H

(4) [figure]

(4): one CH2 ⇒ (4) has 2 secondary H ✓

Answer: (4)

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Ques. 2JEE Main 2026, 8 April (Evening Shift)

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

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

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

  1. 6
  2. 4
  3. 3
  4. 5
Ques. 4JEE Main 2026, 6 April (Evening Shift)

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
Ques. 5JEE Main 2026, 5 April (Morning Shift)

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
Ques. 6JEE Main 2026, 5 April (Evening Shift)

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
Ques. 7JEE Main 2026, 5 April (Evening Shift)

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
Ques. 8JEE Main 2026, 4 April (Morning Shift)

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
Ques. 9JEE Main 2026, 4 April (Evening Shift)

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
Ques. 10JEE Main 2026, 4 April (Evening Shift)

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
Ques. 11JEE Main 2026, 4 April (Evening Shift)

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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