Assertion (A): Following are the members of a homologous series: CH 3 OH, CH 3 CH 2 OH, CH 3 CH 2 CH 2 OH
Reason (R): A series of compounds with same functional group but differing by ––CH 2 – unit is called a homologous series.
Homologous series is a group/sequence of compounds which have the same functional group and similar chemical properties .
The two successive compounds differ by a CH 2 group i.e. 12+(2x1)=14 amu
Since CH 3 OH, CH 3 CH 2 OH, CH 3 CH 2 CH 2 OH all have similar functional groups (OH) and 2 successive compounds differ by CH 2 they belong to the same homologous group.
- Assertion is true.
- Reasoning is true.
- And reasoning is the correct explanation of Assertion.
So, the correct answer is (a) both assertion and reason are correct and reason is the correct explanation for the assertion.