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NEET levelSingle correct optionDifficulty 1 of 3o2006

The peroxide (Kharasch) effect is observed for the addition of which of the following to propene?

A $HI$
B $HBr$
C $HCl$
D $HF$

Answer: B

Only HBr shows the peroxide effect. For HCl the H-Cl bond is too strong for the chain step to be favourable, and for HI the addition of

I \cdot

to the alkene is unfavourable. Hence only HBr gives the anti-Markovnikov product.

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