Correct option is A
Homologous Series:
- A homologous series is a group of organic compounds that have the same functional group and similar chemical properties.
- The members of the series differ by the number of repeating units they contain.
- Compounds of homologous series differ by CH2 from their consecutive members.
- Homologous series of alcohols include:
o methanol (CH3OH),
o ethanol (CH3CH2OH),
o propanol (CH3CH2CH2OH),
o butanol,
o pentanol, etc.