What is meant by homologous series of carbon compounds? Write the general formula of (i) alkenes, and (ii) alkynes

What is meant by homologous series of carbon compounds? Write the general formula of
(i) alkenes, and
(ii) alkynes.
Draw the structure of the first member of each series to show the bonding between the two carbon atoms.

Homologous Series: A homologous series is a organic compounds that belongs to the same family (i.e., possesses the same functional group) and show similar chemical properties. The members of this series are called homologues; they differ from each other by the number of CH2 units in the main carbon chain.
General Formula:
image

Structure: The first member of alkenes is ethene and its structure is given below.
image

The first member of alkynes is ethyne and its structure is given below.
H — C = C — H