Give the common name of (i) ethyne, and (ii) ethane.

31 Write down the structure and name of two isomers of butane (C₄H₁₀). 32 Give the name and structure formula of one member each of the following:

(i) alkane

(ii) alkene

(iii) alkyne

(iv) cycloalkane

32 Write the molecular formula and structure of benzene. 33 What is the unique property of carbon atom? How is the property helpful to us?