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Introduction to E2 Mechanism

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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{C H}_{3} - B r | C | H - C H_{2} - C H_{3} + a l c . K O H \to X

{C H}_{3} - C H | C H_{3} - C H = C H_{2} O_{3} - \to Y + Z

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