Q66 / 160 · JIPMER 2009 · Chemistry

The homologue of ethyne is

  • A
    $\mathrm{C}_2 \mathrm{H}_2$
  • B
    $\mathrm{C}_2 \mathrm{H}_6$
  • C
    $\mathrm{C}_3 \mathrm{H}_8$
  • Correct answer
    D
    $\mathrm{C}_3 \mathrm{H}_4$

Solution

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 $\mathrm{C}_2 \mathrm{H}_2$.

Hence, the correct answer is option: 'D'.

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