Question

(a) Give the general name of the class of compounds having the general formula CnH2n-2.Write name of the first member of this homologous series.
(b) The general formula of a homologous series of carbon compounds is CnH2n. Write the molecular formulae of the second and fourth members of the series.
(c) Write the molecular formulae of the third and fifth members of homologous series of carbon compounds represented by the general formula CnH2n+2.

Lakhmir Singh Chemistry Class 10

Answer 1

a) Alkynes .........Ethyne
b) Alkene.......C2H4 AND C4H8
C) PROPANE AND PENTANE ....

Answer 2

a) Alkynes . .Ethyne b) Alkene..C2H4 AND C4H8 C) PROPANE AND PENTANE