(a) Give the general formula of an : (i) alkane (ii) alkene (iii) alkyne.
(b) Classify the following compounds as alkanes, alkenes and alkynes :
$C_{2} H_{4}, C_{3} H_{4}, C_{4} H_{8}, C_{5} H_{12}, C_{5} H_{8}, C_{3} H_{8}, C_{6} H_{6}$

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Solution

(a)

(i) The general formula of an alkane is $C_{n} H_{2 n + 2}$ .
(ii) The general formula of an alkene is $C_{n} H_{2 n}$ .
(iii) The general formula of an alkyne is $C n H_{2 n - 2}$ .

(b) Alkanes: $C_{5} H_{12}$ and $C_{3} H_{8}$
Alkenes: $C_{2} H_{4}$ and $C_{4} H_{8}$
Alkynes: $C_{3} H_{4}$ and $C_{5} H_{8}$

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