JEE Main · 2022 · 28 Jul 2022 · Shift 1 · Hydrocarbons

Choose the correct option for the following reactions.

(A)'A' and 'B' are both Markovnikov addition products.
(B)'A' is Markovnikov product and 'B' is anti-Markovnikov product.✓ Correct
(C)'A' and 'B' are both anti-Markovnikov products.
(D)'B' is Markovnikov and 'A' is anti-Markovnikov product.

Answer: (B)

Solution

In the first reaction, HBr adds to the alkene following Markovnikov's rule (H to the carbon with more H atoms, Br to the carbon with fewer H atoms), giving product A as the Markovnikov product. In the second reaction with peroxide (ROOR), the addition follows anti-Markovnikov's rule (free radical mechanism), giving product B as the anti-Markovnikov product. Therefore, A is Markovnikov and B is anti-Markovnikov.

JEE Main · 2022 · 28 Jul 2022 · Shift 1 · Single correct option

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