A) \[{{C}_{2}}{{H}_{2}}\]
B) \[{{C}_{2}}{{H}_{6}}\]
C) \[{{C}_{3}}{{H}_{8}}\]
D) \[{{C}_{3}}{{H}_{4}}\]
Correct Answer: D
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 \[{{\text{C}}_{2}}{{\text{H}}_{2}}.\]
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