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JEE Main levelSingle correct optionDifficulty 2 of 3nm187

The number of alkyne isomers (open-chain, structural) of $C X_{5} H X_{8}$ is

A2
B4
C5
D3

Answer: D

Pent-1-yne, pent-2-yne and 3-methylbut-1-yne: 3.

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