Question

Characteristics properties of homologous series

Answer 1

Answer:

1. Each member of the series differs from the preceding one by the addition of CH2 group and by molecular mass of 14a.m.u.
2. All members of the homologous series share the general formula
3. Members of a homologous series have similar chemical properties

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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.