Chemical Process
Styrene (a monomer for the production of polystyrene) is commercially produced by

Dehydration of ethyl alcohol followed by hydrogenation
Catalytic dehydrogenation of ethyl benzene
Reacting ethylene oxide with acetal-dehyde
Fermentation of starch

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Chemical Process
DDT stands for

Dichloro-diphenyl-trichloromethane
Dichloro-diphenyl-trichloroethane
Diethyl-diphenyl-trichloromethane
Diphenyl-dichloro-trichloromethane

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