The next homologue of ethyne is ___.

propyne

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butyne

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Solution

Homologous series of compound lies in the same family and the molecular formula is different by one ${CH}_{2}$ unit.
If a compound adds or subtracts by one unit of ${CH}_{2}$ from that compound then it is a homologous compound.
The homologous of Ethyne $(C_{2} H_{2})$ compound is by adding one unit of ${CH}_{2}$
$C_{2} H_{2} + {CH}_{2} \to C_{3} H_{4} Ethyne Propyne (lower homologue) (higher homologue)$
Hence, Propyne $(C_{3} H_{4})$ is the next homologue of Ethyne.
Final answer:
The next homologue of Ethyne is Propyne.

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