2009 Section 2 Question 2

2) E

Only molecules that contain a double bond can participate in an addition polymerisation. Such molecules have twice as many other atoms as there are carbon atoms. e.g. C₃H₆_, C₄H₈ 

The only molecules that contain twice as many other atoms as carbon atoms in the molecule are C₂₄H₄₈,   C₄H₆Cl₂, C₈H₁₂Cl₄