Question

(a) Give the general name of the class of compounds having the general formula C_nH_2n-2 .Write name of the first member of this homologous series.

(b) The general formula of a homologous series of carbon compounds is C_nH_2n . 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 C_nH_2n+2

Answer 1

(a) Alkynes, C_nH_2n-2

First member: Ethyne

(b) Second member: C₃H₆

Fourth member: C₅H₁₀

(c) Third member: C₃H₈

Fifth member: C₅H₁₂