The reagents required for the following two-s | vedclass

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(B) The transformation involves the conversion of styrene to $(1-	ext{bromoethyl})	ext{benzene}$ followed by nucleophilic substitution to form $(1-\

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$(i) \ HBr; (ii) \ NaCN$

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(B) The transformation involves the conversion of styrene to $(1-	ext{bromoethyl})	ext{benzene}$ followed by nucleophilic substitution to form $(1-	ext{cyanoethyl})	ext{benzene}$.Step $1$: Styrene reacts with $HBr$ via electrophilic addition following Markownikoff's rule to yield $(1-	ext{bromoethyl})	ext{benzene}$.Step $2$: The resulting alkyl bromide undergoes nucleophilic substitution ($S_N2$ or $S_N1$ depending on conditions,typically $S_N2$ with $NaCN$) to replace the bromine atom with a cyano group $(-CN)$,yielding the final product.

The reagents required for the following two-step transformation are:

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