Question

List two characteristics of a homologous series.

Answer 1

Answer:

Features include a general formula and neighbouring members differing by CH2, with similar chemical properties and with a gradation in physical properties. Homologous series are 'families' of organic compounds. They share common characteristics: They all contain the same functional group.

Explanation:

Answer 2

Answer:

definition of homologous series : -

A series of compounds of the same family in which each member has the same type of carbon skeleton and functional group, and differs from the next member by a constantndifference of one methylene group (- CH_2 - )nin its molecular and structural formula is called as homologous series. An individual member of a homologous series is called homologue.

Characteristics of homologous series are :

(1) Each member of the homologous series can be represented by a general formula.

(2) Homologues have same functional groups and similar chemical properties.

(3) Two successive homologues differ by one-CH_2 (methylene) unit and hence molecular weight of each successive member differs by 14.

(4) All the members of a homologous series can be prepared by similar methods.

(5) Physical properties (like melting point, boiling point, density) of the homologues show a gradual change with increase in the molecular weight of the member. Example : Homologous series of alcohols have general formula C_n H_2n+_1OH.