Question

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

Answer 1

Answer:

c2h2 is the homologous series having formula CnH2n-2 and its name is ethene

Answer 2

The name and formula of second member of homologous series with molecular formula is $C_nH_{2n-2}$ is propyne ($C_3H_4$).

Explanation:

• The unsaturated hydrocarbon with the general formula $C_nH_{2n-2}$ is called alkynes.
• To find the $2^{nd}$member of homologous series, consider n = 3, as first member of series contains two carbons. Accordingly

$2^{nd}$ member of homologous series of alkyne = $C_nH_{2n-2}$

$2^{nd}$ member of homologous series of alkyne = $C_3H_{2(3)-2}$

$2^{nd}$ member of homologous series of alkyne =  $C_3H_{6-2}$

$2^{nd}$ member of homologous series of alkyne =  $C_3H_4$

• The name of the obtained formula $C_3H_4$ is Propyne. Thus it is the second member of homologous series of alkyne with general formula $C_nH_{2n-2}$.

Learn more about such concept

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

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