The number of acyclic structural isomers (including geometrical isomers) for pentene are ___________
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Correct Answer: 6
Solution and Explanation
Straight chain: (1) pent-1-ene; (2) pent-2-ene, which shows geometrical isomerism: (2a) cis-pent-2-ene and (2b) trans-pent-2-ene.
Branched chain (four-carbon chain with a methyl group): (3) 2-methylbut-1-ene; (4) 3-methylbut-1-ene; (5) 2-methylbut-2-ene.
Pent-1-ene, 2-methylbut-1-ene, 3-methylbut-1-ene and 2-methylbut-2-ene show no geometrical isomerism, since one alkene carbon carries two identical groups.
Total = 1 + 2 + 1 + 1 + 1 = 6
Answer: 6
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