JEE Main · 2026 · 23 Jan 2026 · Shift 2 · Haloalkanes and Haloarenes

Identify (P)

(A)(see structure)
(B)(see structure)
✓ Correct
(C)(see structure)
(D)(see structure)

Answer: (B)

Solution

The reaction shows a cyclic alkene undergoing hydrobromination with HBr in the presence of peroxide. In the presence of peroxide, the reaction follows an anti-Markovnikov pathway (free radical mechanism), where Br adds to the less substituted carbon.

The starting material is 1-methylcyclopentene. Under anti-Markovnikov addition, the Br will add to the terminal carbon of the double bond, and H will add to the more substituted carbon, giving 1-bromo-1-methylcyclopentane.

The correct product is shown in option (2).

JEE Main · 2026 · 23 Jan 2026 · Shift 2 · Single correct option

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