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(D) The conversion of ethylbenzene $(C_6H_5CH_2CH_3)$ to styrene $(C_6H_5CH=CH_2)$ requires a two-step process: $1$. Benzylic bromination using $NBS$

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$NBS, alc. KOH$

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(D) The conversion of ethylbenzene $(C_6H_5CH_2CH_3)$ to styrene $(C_6H_5CH=CH_2)$ requires a two-step process: $1$. Benzylic bromination using $NBS$ ($N$-Bromosuccinimide) in the presence of light or peroxide to form $C_6H_5CH(Br)CH_3$. $2$. Dehydrohalogenation using alcoholic $KOH$ $(alc. KOH)$ to eliminate $HBr$ and form the double bond,resulting in styrene $(C_6H_5CH=CH_2)$.

Which sequence of reagents is useful for the conversion of $C_6H_5CH_2CH_3$ to $C_6H_5CH=CH_2$?

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