Which of the following compounds is an example of a homologous series of alcohols?

Concept- Homologous series are series of compounds having same function group differing only by

group.
Consider the given options; all of them are alcohols with no multiple bonds. The general formula for such a homologous series is

. First one is methanol (

), the molecular formula is

. Second option is ethanol (

), molecular formula being

. Third one is propanol (

), with molecular formula

. Clearly, all of them differs by a

group. Thus, all of the above belong to one homologous series.
Hence, the correct option is (4).

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