A hydrocarbon molecule has 3 carbon atoms. Write down its molecular formulae if it is an
(i) alkane
(ii) alkene
(iii) alkyne

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Solution

a) The molecular formula of alkane having three carbon atoms is C₃H₈ (Propane) .
b) The molecular formula of alkene having three carbon atoms is C₃H₆ (Propene) .
c) The molecular formula of alkyne having three carbon atoms is C₃H₄ (Propyne).

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