JEE Main 2026 — Jan 23, Shift 2 — Chemistry solution

JEE Main2026Jan 23, Shift 2Chemistry

Given below are two statements:

Statement I: $(C H_{3})_{3} C \oplus$ is more stable than $C \oplus H_{3}$ as nine hyperconjugation interactions are possible in $(C H_{3})_{3} C \oplus$ .

Statement II: $C \oplus H_{3}$ is less stable than $(C H_{3})_{3} C \oplus$ as only three hyperconjugation interactions are possible in $C \oplus H_{3}$ .

In the light of the above statements, choose the correct answer from the options given below.

A
Statement I is true but Statement II is false
B
Both Statement I and Statement II are true
C
Both Statement I and Statement II are false
D
Statement I is false but Statement II is true

Solution

Statement I: $(C H_{3})_{3} C^{+}$ has three methyl groups attached to the cationic carbon. Each methyl group contributes 3 C-H bonds that can hyperconjugate with the empty p-orbital, giving $3 \times 3 = 9$ hyperconjugative interactions. This stabilises the tert-butyl cation strongly. True.

Statement II: $C H_{3}^{+}$ has no $α$ -C-H bonds (no adjacent sp $^{3}$ carbon), so the number of hyperconjugation interactions is zero, not three. False.

$∴$ Statement I is true, Statement II is false.

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