What is the IUPAC name of CH2=CH-CH2-C#CH?

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JEE Main levelSingle correct optionDifficulty 2 of 3nm039

What is the IUPAC name of $CH X_{2} = CH - CH X_{2} - C \equiv CH$ ?

Apent-4-en-1-yne
Bpent-1-en-3-yne
Cpent-2-en-4-yne
Dpent-1-en-4-yne

Answer: D

Both ends of the chain give the locant set {1,4} for the multiple bonds (ene 1, yne 4 from the left; yne 1, ene 4 from the right). When the locant sets tie, the double bond gets the lower locant. So the numbering starts at the CH2= end and the name is pent-1-en-4-yne.

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What is the IUPAC name of $CH X_{2} = CH - CH X_{2} - C \equiv CH$ ?