PYQ Vault
EbooksTutor

Statements about hyperconjugation and carbocation stability

This type of question, asked 3 times: 2021 Paper 17, 3 Apr 2025, 23 Jan 2026 S2. All 3 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2021 Paper 17

    37
    Given below are two statements: Statement I: Hyperconjugation is a permanent effect. Statement II: Hyperconjugation in ethyl cation (CH3−C+H2)\left( CH_{3}-\overset{+}{C}H_{2} \right) involves the overlapping of Csp 2−H1 sC_{sp}\ ^{2}-H_{1\text{ }s} bond with empty 2p2p orbital of other carbon. Choose the correct option:

    Tap an option to check your answer.

  2. Question 2

    3 Apr 2025

    115
    Given below are two statements : Statement I : Hyperconjugation is not a permanent effect. Statement II : In general, greater the number of alkyl groups attached to a positively charged C -atom, greater is the hyperconjugation interaction and stabilization of the cation. In the light of the above statements, choose the correct answer from the options given below

    Tap an option to check your answer.

  3. Question 3

    23 Jan 2026 S2

    32
    Given below are two statements: Statement I: (CH3)3C⊕\left( {CH}_{3} \right)_{3}\overset{\oplus}{C} is more stable than C⊕H3\overset{\oplus}{C}H_{3} as nine hyperconjugation interactions are possible in (CH3)3C⊕\left( {CH}_{3} \right)_{3}\overset{\oplus}{C}. Statement II: C⊕H3\overset{\oplus}{C}H_{3} is less stable than (CH3)3C⊕\left( {CH}_{3} \right)_{3}\overset{\oplus}{C} as only three hyperconjugation interactions are possible in C⊕H3\overset{\oplus}{C}H_{3}. In the light of the above statements, choose the correct answer from the options given below.

    Tap an option to check your answer.