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How is phthalic anhydride manufactured?

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How is phthalic anhydride manufactured?

(a) Dehydrogenation of ethyl benzene

(b) Hydrogenation dehydration of acetophenone

(c) Benzene sulphurated process

(d) Oxidation of naphthalene

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The origin of the question is Synthetic Organic Chemical in portion Synthetic Organic Chemical Industries of Chemical Technology

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Right choice is (d) Oxidation of naphthalene

Easiest explanation: Naphthalene mixture are melted and vaporized later it undergoes conversion in a fixed bed converter. Dehydrogenation of ethyl benzene and Hydrogenation dehydration of acetophenone is used for the manufacture of styrene.

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