The lowest alkene which can exhibit position isomerism is:

butene

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propene

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pentene

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butane

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Solution

The correct option is A butene
Butane has no possitional isomerism only chain isomerism.
propane $C H_{3} - C H = C H_{2}$ has no positional isomerism
$C H_{2} = C H - C H_{2} - C H_{3}$ $C H_{3} - C H = C H - C H_{3}$
1 Butene 2- Butene.
So lowest alkene which can exhibit positional isomerism is Butene.

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