IUPAC name of the following compound is $C H_{3} - C H = C H - C \equiv H$ ?

5-Pentyn-3-ene

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3-Penten-1-yne

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1-Pentyn-3-ene

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None of these

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Solution

The correct option is B
3-Penten-1-yne

$1 C H_{3} 5 - 2 C H 4 = 3 C H 3 - 4 C 2 \equiv 5 C H 1$

From lowest sum rule, we will select $1, 3$ and not $2, 4$

Five carbons $\Rightarrow$ word root = pent

3-Penten-1-yne

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