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Solution


Q.

By how much atomic mass unit successive members of a homologous series vary
1 One  
2 Sixteen  
3 Fourteen  
4 Twelve  

Ans.

(3)

In homologous series, the two consecutive members will differ by CH₂ unit or 14 amu.
The molecular masses of first three members of alkanes with general formula CₙH₂ₙ₊₂ are shown below:
Methane (CH₄) = 16 amu
Ethane (C₂H₆) = 30 amu
Propane (C₃H₈) = 44 amu
From the above examples, it is clear that atomic mass unit of successive members of a homologous series vary by 14 amu.