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Which among the following methods is not used for the manufacture of isoprene?

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Which among the following methods is not used for the manufacture of isoprene?

(a) Isomerization of propylene dimer

(b) Isobutylene formaldehyde reaction

(c) Methyl ethyl ketone formaldehyde reaction

(d) Ethylene cyanohydrin pyrolysis

This question was addressed to me at a job interview.

Origin of the question is C3 Compounds in portion Synthetic Organic Chemical Industries of Chemical Technology

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Right answer is (d) Ethylene cyanohydrin pyrolysis

Explanation: Ethylene cyanohydrin pyrolysis is done for the manufacture of industrial acrylonitrile whereas Isomerization of propylene dimer, Isobutylene formaldehyde reaction and Methyl ethyl ketone formaldehyde reaction is done for the manufacture of isoprene.

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