alleryWhich of the following pairs are members of the same homologous series?
AMethane and ethane
BEthane and ethene
CPropane and propyne
DEthyne and ethanol
Answer & Solution
Correct answer: A. Methane and ethane
1. Members of one homologous series share the same general formula and differ by a –CH₂ group.
2. Ethane (alkane) and ethene (alkene) belong to different series, so rule that out.
3. Propane (alkane) and propyne (alkyne) differ in bond type, so rule that out; ethyne and ethanol are different classes too.
4. Methane (CH₄) and ethane (C₂H₆) are both alkanes differing by –CH₂, so they are homologs.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 11 "Carbon and its Compounds", p.166_
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