Write down the structure and name of two isomers of butane (C₄H₁₀).

30 Give any two differences between the properties of diamond and graphite. What causes these differences? 31 Why does the element carbon form a large number of carbon compounds? 32 Give the name and structure formula of one member each of the following:

(i) alkane

(ii) alkene

(iii) alkyne

(iv) cycloalkane

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