Question

Write the name and formula of the second member of homologous series having general formula cnh2n

Answer 1

since it is second member of the series so we will put n=2
now after putting n=2 the formula becomes
C2H4
and its name is ethene because alkenes have (cnh2n)this general formula

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Answer 2

Answer: The chemical formula for the compound is $C_2H_4$ and is named as ethene.

Explanation:

Homologous series is defined as the series which have same functional group and show similar chemical properties with each successive member differing by $CH_2$ group.

The general formula given to us is $C_nH_{2n}$ which is the formula for alkenes that have double bond.

The second member of this series is when n = 2. The chemical formula for that member will be $C_2H_4$ and is known as ethene.