Question

Write the name and formula of the 2nd member of homologous series having general formula CnH2n+2(Delhi - 2015)

Answer 1

Explanation:

The name of the second member of homologous series is Propene with chemical formula C3H6 it belongs to the group of alkenes.

Answer 2

The name and formula of second member of homologous series with molecular formula is $C_nH_{2n+2}$ is ethane ($C_2H_6$).

Explanation:

• The unsaturated hydrocarbon with the general formula $C_nH_{2n+2}$ is called alkanes.
• To find the $2^{nd}$ member of homologous series, consider n = 2. Accordingly

$2^{nd}$ member of homologous series of alkane = $C_nH_{2n+2}$

$2^{nd}$ member of homologous series of alkane = $C_2H_{2(2)+2}$

$2^{nd}$ member of homologous series of alkane = $C_2H_{4+2}$

$2^{nd}$ member of homologous series of alkane = $C_2H_6$

• The name of the obtained formula $C_2H_6$ is Ethane. Thus it is the second member of homologous series of alkane.

Learn more about such concept

Write the molecular formula of an alkyne containing 10 atoms of hydrogen.

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Name the second member of alkyne series and give its structure

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