Question

Choose the correct answer: 

A hydrocarbon with molecular mass 72 is
(i) an alkane (ii) an alkene (iii) an alkyne 

Answer 1

Correct answer: (ii)
As the formula of Alkene is CnH2n. Thus n + 2n = 72
3n = 72
n = 24
By filling value we get the molecular mass 72.