A) butane
B) pentane
C) hexane
D) heptane
Correct Answer: C
Solution :
The molecular formula of ethane is \[{{C}_{2}}{{H}_{6}}.\]To get its fourth homologue, we have to add \[\text{4}\,\text{ }\!\!\times\!\!\text{ }\,\text{C}{{\text{H}}_{\text{2}}}\text{=}\,{{\text{C}}_{\text{4}}}{{\text{C}}_{\text{8}}}\]to it. \[{{C}_{2}}{{H}_{6}}+{{C}_{4}}{{H}_{8}}={{C}_{6}}{{H}_{14}}\] \[{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{14}}}\]is the molecular formula of hexane. Thus, hexane is the fourth homologue of ethane.
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