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What are the series of chemical reactions in manufacture of isoprene from isomerization of polypropylene dimer?

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What are the series of chemical reactions in manufacture of isoprene from isomerization of polypropylene dimer?

(a) Dimerization-Isomerization-Pyrolysis

(b) Pyrolysis-Isomerization-Dimerization

(c) Dimerization-Pyrolysis-Isomerization

(d) Pyrolysis-Dimerization-Isomerization

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This question is from C3 Compounds topic in portion Synthetic Organic Chemical Industries of Chemical Technology

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Correct option is (a) Dimerization-Isomerization-Pyrolysis

To explain: Initially propylene is dimerized using tripropyl aluminium as catalyst which forms 2-methyl-1-pentene which further on isomerization forms 2-methyl-2-pentene and finally undergoes pyrolysis to form isoprene.

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