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Organic Chemistry – Some Basic Principles and Techniques

JEE Main 2026 (Online) 24th January Morning ShiftMCQEasy📈 Topic in 5% papers+4−1
Ques. 1JEE Main 2026, 24 January (Morning Shift)

Arrange the following alkenes in decreasing order of stability. [figure] Choose the correct answer from the options given below:

  1. III > I > II > IV
  2. III > II > I > IV
  3. I > III > II > IV
  4. I > III > IV > II

Answer

(3) I > III > II > IV

Solution

Stability of alkenes increases with the number of α-hydrogens (hyperconjugation) / alkyl groups on the C=C carbons:

I: 2,3-dimethylbut-2-ene, tetrasubstituted, 12 α-H

III: 2-methylbut-2-ene, trisubstituted, 9 α-H

II: trans-but-2-ene, disubstituted, 6 α-H

IV: cis-but-2-ene, disubstituted, 6 α-H

I > III > (II, IV)

Between II and IV: in the cis isomer the two CH3 groups are on the same side and repel each other (steric strain), so the trans isomer is more stable (lower heat of hydrogenation).

I > III > II > IV

Answer: (3)

Keep practising — Organic Chemistry – Some Basic Principles and Techniques

Ques. 2JEE Main 2026, 24 January (Morning Shift)

Arrange the following carbanions in the decreasing order of stability. I. p-Br-C6H4- CH2 II. C6H5- CH2 III. p-CH3O-C6H4- CH2 IV. p-CHO-C6H4- CH2 V. p-CH3-C6H4- CH2 Choose the correct answer from the options given below :

  1. I > II > IV > V > III
  2. IV > II > I > III > V
  3. I > IV > II > V > III
  4. IV > I > II > V > III
Ques. 3JEE Main 2026, 24 January (Evening Shift)

Find out the statements which are not true. Choose the correct answer from the options given below :

  1. A, D & E only
  2. A, C & D only
  3. B & D only
  4. B, D & E only
Ques. 4JEE Main 2026, 23 January (Evening Shift)

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

  1. Statement I is false but Statement II is true
  2. Statement I is true but Statement II is false
  3. Both Statement I and Statement II are true
  4. Both Statement I and Statement II are false
Ques. 5JEE Main 2026, 22 January (Evening Shift)

The IUPAC name of the following compound is : [figure]

  1. 2-bromo-5-methylhexylpropanoate
  2. n-propyl-1-bromo-4-methylhexanoate
  3. n-propyl-2-bromo-5-methylheptanoate
  4. 2-bromo-5-methylpropanoate
Ques. 6JEE Main 2026, 21 January (Morning Shift)

From the following, the least stable structure is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 7JEE Main 2025, 8 April (Evening Shift)

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

  1. A-IV, B-II, C-III, D-I
  2. A-II, B-III, C-I, D-IV
  3. A-III, B-IV, C-I, D-II
  4. A-III, B-IV, C-II, D-I
Ques. 8JEE Main 2025, 8 April (Evening Shift)

What is the correct IUPAC name of the compound? [figure]

  1. 1-Ethylcyclopent-2-en-3-ol
  2. 4-Ethylcyclopent-2-en-1-ol
  3. 1-Ethyl-3-hydroxycyclopent-2-ene
  4. 4-Ethyl-1-hydroxycyclopent-2-ene
Ques. 9JEE Main 2025, 7 April (Morning Shift)

Which of the following is the correct IUPAC name of given organic compound (X)? [figure]

  1. 4-Bromo-3-methylbut-2-ene
  2. 1-Bromo-2-methylbut-2-ene
  3. 3-Bromo-3-methylprop-2-ene
  4. 2-Bromo-2-methylbut-2-ene
Ques. 10JEE Main 2025, 4 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 true
  2. Statement I is true but Statement II is false
  3. Statement I is false but Statement II is true
  4. Both Statement I and Statement II are false
Ques. 11JEE Main 2025, 4 April (Evening Shift)

The IUPAC name of the following compound is: HC C-CH2- OH |CH-CH2-CH=CH2

  1. 4-Hydroxyhept-6-en-1-yne
  2. Hept-1-en-6-yn-4-ol
  3. Hept-6-en-1-yn-4-ol
  4. 4-Hydroxyhept-1-en-6-yne

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