The starting material for the preparation of styrene is:

Ethane

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Ethene

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Ethyne

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Vinyl chloride

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Solution

The correct option is D Ethene
The vast majority of styrene is produced from ethylbenzene and ethylbenzene is produced via Friedel–Crafts reaction between benzene and ethylene using aluminum chloride as a catalyst that has been replaced by zeolites later.
Styrene is produced by the dehydrogenation of ethylbenzene. The reaction is highly endothermic and reversible.
From the options, we can say ethene is the answer.
Hence, option $B$ is correct.

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