Q. 35.0( 4 Votes )

What is meant by

Answer :

The series which consists of similar structures and similar chemical properties in which the successive compounds differs by a CH2 group is termed as homologues series.

The two characteristics of homologues series are as follows:

1. The members of the homologues series consists of same general formula such as Alkanes have general formula CnH2n+2

2. The two adjacent homologues have a difference of molecular mass of 14 u.

The general formula for alkenes and alkynes are as follows:

(i) Alkenes, CnH2n

(ii) Alkynes, CnH2n-2

The first member of the series of alkenes is : Ethane which has formula CH4 and the first member of series of Alkynes is: Ethne and have formula C2H2 the structure is as follows:


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