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The homologue of ethyne is
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$\mathrm{C}_3 \mathrm{H}_4$
Ethyne is nothing but $\mathrm{C}_2 \mathrm{H}_2$ ie, acetylene which can be represented by general molecular formula $\mathrm{C}_n \mathrm{H}_{2 n-2}$. Only $\mathrm{C}_3 \mathrm{H}_4$ tallies with the formula. Hence, $\mathrm{C}_3 \mathrm{H}_4$ is the homologue of $\mathrm{C}_2 \mathrm{H}_2$.
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