Q3 / 75 · JEE Main 2026 (23 January Shift 2) · Chemistry
Identify (P)
Identify (P)
- A
- B
- C
- Correct answerD
Solution
The vicinal dibromide undergoes elimination with $\text{Zn}/\Delta$ to form cyclohexene.
Cyclohexene reacts with HBr. The secondary carbocation formed undergoes a 1,2-hydride shift to give a more stable tertiary carbocation, which then combines with $\text{Br}^-$ to give 1-bromocyclohexane (with Br at the more substituted position).
The major product (P) is 1-bromo-1-methylcyclohexane (tertiary alkyl bromide).
Cyclohexene reacts with HBr. The secondary carbocation formed undergoes a 1,2-hydride shift to give a more stable tertiary carbocation, which then combines with $\text{Br}^-$ to give 1-bromocyclohexane (with Br at the more substituted position).
The major product (P) is 1-bromo-1-methylcyclohexane (tertiary alkyl bromide).
Hence, the correct answer is option: 'D'.