write a short note on homologous series and write first four members of homologous series of alkanes, alcohol,aldehyde begins with HCHO?
Answers
Answer:
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Explanation:
A group of organic compounds which can be represented by the same general formula with a same functional group and which show more or less similar trends in their properties is known as homologous series.
Example: The homologous series of straight chain alkanes can be represented by the general formula C
n
H
2n+2
Thus the first four members of alkane homologous series are CH
4
(methane),
CH
3
−CH
3
(Ethane), CH
3
−CH
2
−CH
3
(propane) and CH
3
−CH
2
−CH
2
−CH
3
(butane).
Characteristics of a homologous series are:
(i) Each member of the series can be represented by a general formula.
(ii) All the members of the series can be prepared by the same general methods.
(iii) Physical properties changes throughout the series in a regular way.
(iv) Members of homologous series have similar chemical properties.
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