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The number of acyclic structural isomers (including geometrical isomers) for pentene are ____

1. 4
2. 5
3. 6
4. 7

Correct answer: 6

Solution

Structural isomers: pent-1-ene, pent-2-ene, 2-methylbut-1-ene, 3-methylbut-1-ene, 2-methylbut-2-ene (5). Pent-2-ene has cis and trans forms, adding 1 -> total 6.

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