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Which process is used for the manufacture of styrene?

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Which process is used for the manufacture of styrene?

(a) Dehydrogenation of ethyl benzene

(b) Hydrogenation of acetophenone

(c) Hydrogenation of toluene

(d) Benzene sulphurated process

This question was posed to me in exam.

Origin of the question is Synthetic Organic Chemical topic in chapter Synthetic Organic Chemical Industries of Chemical Technology

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Right choice is (a) Dehydrogenation of ethyl benzene

For explanation I would say: Styrene is manufactured first by alkylation of benzene followed by dehydrogenation of ethyl benzene. Hydrogenation of toluene is used for the manufacture of benzene.

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