(a) Give the general formula of an : (i) alkane (ii) alkene (iii) alkyne.
(b) Classify the following compounds as alkanes, alkenes and alkynes:
C₂H₄, C₃H₄, C₄H₈, C₅H₁₂, C₅H₈, C₃H₈, C₆H₆

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Solution

(a)
(i) The general formula of an alkane is CnH_2n₊₂.
(ii) The general formula of an alkene is C_nH_2n.
(iii) The general formula of an alkyne is C_nH_2n-2.

(b) Alkanes: C₅H₁₂and C₃H₈
Alkenes: C₂H₄ and C₄H₈
Alkynes: C₃H₄ and C₅H₈

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