Which of the ...

Question

Which of the following sequence of reactions (reagents) can be used for the conversion of $P h {C H}_{2} {C H}_{3}$ into $P h C H = {C H}_{2}$ ?

S O {C l}_{2}; H_{2} O

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{S O}_{2} {C l}_{2}; a l c . K O H

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{C l}_{2} / h v; H_{2} O

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S O {C l}_{2}; a l c . K O H

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Solution

The correct option is B ${S O}_{2} {C l}_{2}; a l c . K O H$
Ethyl benzene can be converted to styrene by using sulphuryl chloride followed by alc. KOH. Sulphuryl chloride is used for the allylic substitution and alc. KOH is used for dehydrochlorination.

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