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Q.
The homologue of ethyne is:
EAMCETEAMCET 2006
Solution:
Ethyne is nothing but $ {{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}} $ i.e., acetylene Which can be represented by general molecular formula $ {{\text{C}}_{\text{n}}}{{\text{H}}_{\text{2n}-2.}} $ Only $ {{\text{C}}_{\text{3}}}{{\text{H}}_{\text{4}}} $ tallies with the formula. Hence, $ {{\text{C}}_{\text{3}}}{{\text{H}}_{\text{4}}} $ is the homologue of $ {{\text{C}}_{2}}{{\text{H}}_{2}}. $