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Solution


Q.

Which of the following does not belong to the same homologous series
1 CH4  
2 C2H6  
3 C3H8  
4 C4H8  

Ans.

(4)

CH4, C2H6, C3H8 are all saturated carbon compounds with general formula CnH2n+2 whereas C4H8 is an alkene with general formula CnH2n. Thus, C4H8 does not belong to the same homologous series as it is an alkene.