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Question

The first three members of a homologous series are CH4,C2H6,C3H8 the fifth member


A

C5H12

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B

C5H8

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C

C5H10

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D

C5H14

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Solution

The correct option is A

C5H12


Explanation for correct option:

A. C5H12

Homologous series:

  • “The ability of carbon to form chains gives rise to a homologous series of compounds in which the same functional group is attached to carbon chains of different lengths.”
  • It is given that the first three members of a homologous series are CH4,C2H6,C3H8. It is a homologous series of alkanes.
  • Alkanes have a general molecular formula which is CnH2n+2.
  • Thus, the fifth member of this series will be, n=5,C5H(2×5+2)=C5H12

Explanation for incorrect options:

As the fifth member of the homologous series is C5H12. Thus, options B, C, and D are incorrect.

Hence, the correct option is A i.e. C5H12.


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