IUPAC name of $C H_{3} - C H = C H - C \equiv C H$ is:

Pent-2-en-4-yne

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Pent-3-en-1-yne

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Pent-3-yn-1-ene

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Pent-2-yn-1-ene

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Solution

The correct option is B Pent-3-en-1-yne
The IUPAC name of CH3−CH=CH−C≡CH is pent-3-en-1-yne

Priority is given to triple bond (terminal) over double bond and the parent carbon chain has 5 carbons.
Thus, the correct option is $B$

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C H_{3} - C H = C H - C \equiv C - C \equiv C H

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