How many chain isomers does butene have?

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Solution

The correct option is B 2
Chain isomers are molecules with the same molecular formula but different arrangement of carbon skeleton.
The two chain isomers of butene are
1. n-butene : $C H_{3} C H_{2} C H = C H_{2}$ (Here, the parent chain has 4 carbon atoms.)
2. Isobutene: $C H_{3} C (C H_{3}) = C H_{2}$ (Here, the parent chain has 3 carbon atoms.)

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