Question

The maximum number of isomers for an alkene with the molecular formula C₄H₈ is (a) 2 (b) 3(c) 4 (d) 5

Answer 1

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Answer 2

Butene has a rigid double bond. It can form 4 isomers which are

1 butene

2 methyl propene

cis-2- butene

trans-2-butene

The double bond rearranges to form cyclic structures which are cyclobutane and methyl cyclo-propane. Though these are same empirical formula as butene isomers, these are not alkenes.

Hence, the maximum number of isomers of butene is 4

the answer is (c) 4