atomic mass unit successive members of a homologous s

Question

By how much atomic mass unit successive members of a homologous series vary?

Smart Achievers · Accepted Answer

(3)

In homologous series, the two consecutive members will differ by $C H ₂$ unit or 14 amu.
The molecular masses of first three members of alkanes with general formula $C ₙ H ₂ ₙ ₊ ₂$ are shown below:
Methane $(C H ₄)$ = 16 amu
Ethane $(C ₂ H ₆)$ = 30 amu
Propane $(C ₃ H ₈)$ = 44 amu
From the above examples, it is clear that atomic mass unit of successive members of a homologous series vary by 14 amu.

Solution

Q.
By how much atomic mass unit successive members of a homologous series vary

1 One

2 Sixteen

3 Fourteen

4 Twelve

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