The first member of alkyne homologous series is 

(a) ethyne 

(b) ethene 

(c) propyne 

(d) methane 

Answers (1)

Answer: (a)

Solution:

A homologous series is a group of organic compounds having similar structures and similar chemical properties in which the successive compounds differ by CH_2 group.

The general formula of alkyne is C_nH_{2n-2} where n is the number of carbon atoms. The first member of alkyne homologous series is ethyne C_2H_2 as you need 2 carbons minimum to have a carbon connected with double bond.

Therefore, option (a) is correct.

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