JEE Main Chemistry question

In which of the following will the Kharasch (peroxide) effect operate to give an anti-Markovnikov product?

(A)CHCHCH=CH + HCl
(B)CHCHCH=CH + HBrCorrect
(C)CHCH=CHCH + HBr
(D)CHCHCH=CH + HI

Answer: (B)

Solution

The peroxide (Kharasch) effect operates uniquely for HBr among the hydrogen halides, because only the H–Br bond-energy/radical-stability balance makes the free-radical chain mechanism thermodynamically favourable (HCl's chain is endothermic at the propagation step, and HI's is likewise

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Question ID VK-142603