Question

Identify the product obtained in the following reaction.

$CH_3 + HBr \longrightarrow Product$

• A.
• B.
• C.
• D.

Answer 1

Answer: (C)

Option (C)

Answer 2

The starting material is a cyclopentene with a methyl group on one of the vinylic carbons. On reaction with HBr, the electrophilic addition follows Markovnikov's rule. This means that the proton (H⁺) adds to the less substituted carbon of the double bond while the bromide (Br⁻) attaches to the more substituted one (the one bearing the CH₃ group). Thus, the product is a cyclopentane with the CH₃ and Br on the same carbon, i.e., 1‑bromo‑1‑methylcyclopentane.