Correct IUPAC naming of the given compound is:

pent-

3

-ene

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2, 2

-diethylethene

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hexene

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2-ethylbutene

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Solution

The correct option is D 2-ethylbutene
According to IUPAC rule, multiple bond should include in parental chain even if the number of carbons in parental chain decreases. Hence the given compound is 2-ethylbutene in which ethyl group is considered as substituent.

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