1.

(i)What is homologous series of organic compounds? State any two characteristics of a homologousseries. (ii) Draw the electron dot structure for propanal.

Answer»

Solution :(i) A series of compounds in which the same FUNCTIONAL group substitutes for hydrogen in a carbon CHAIN is called homologous sereis.
Characteristics of homologous series:
(a) The molecular formulae of any two successive members of a homologous series DIFFER by `-CH_(2)`.
(b) There is a regular gradation in PHYSICAL properties of members of a homologous series.
(ii) Propanal `(CH_(3)-CH_(2)-CHO)`


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