Answer:
A homologous series can be
defined as a family of organic compounds having the same functional group,
similar chemical properties and the successive members of which differ by a 
group
or 14 mass units. For example, 
(methanol),
(ethanol),
(propanol),
(butanol),
etc. constitute a homologous series of alcohols. They have the same functional
group, i.e., OH (hydroxyl). Since they have the same functional group,
they show similar chemical properties. The difference between any two successive
members is a 
group
or 14 mass units. Their physical properties such as melting point and boiling
point increase as the molecular mass increases. Their solubility in water, however,
decreases with increase in molecular mass.
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