The IUPAC name of the following structure $C H_{3} - C H = C (C H_{3}) - C \equiv C - C H_{3}$ is:

3-methylhept-4-yn-2-ene

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3-methylhex-2-en-4-yne

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4-methylhept-4-en-4-yne

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none of these

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Solution

The correct option is B 3-methylhex-2-en-4-yne
The parent carbon atom is hexane. It contains a double bond at second carbon atom and a triple bond at fourth carbon atom
A methyl group is present at third carbon atom.
Hence, the IUPAC name of $C H_{3} - C H = C (C H_{3}) - C \equiv C - C H_{3}$ is 3- methylhex-2-en-4-yne.

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