JEE Main 2026 — Jan 28, Shift 2 — Chemistry solution

JEE Main2026Jan 28, Shift 2Chemistry

The cyclic cations having the same number of hyperconjugation are :

Choose the correct answer from the options given below:

A
A and C Only
B
B and C Only
C
A and B Only
D
A, C and D only

Solution

Count $α$ -hydrogens (C-H bonds on carbons directly attached to the carbocationic centre) for each cation:

(A) Cation flanked by a ring -CH $_{2}$ - (2H), the other ring -CH $_{2}$ - (2H), and a -CH $_{2}$ -CH $_{3}$ side chain ( $α$ = 2H of CH $_{2}$ ): total 6 $α$ -H.

(B) Cation with three adjacent CH neighbours including a CH $_{3}$ substituent: count gives 7 $α$ -H.

(D) Bridge-type cation with fewer free $α$ -H's available: 5 $α$ -H.

A and C both have 6 $α$ -H — same number of hyperconjugative C-H bonds.

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