How to deduce the polymerisation reaction for any alkene

2 marks · Hard

The monomer CH2=CHCH2F can undergo addition polymerisation.

Write the formula for the repeat unit of the polymer formed and state its name.

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

Show answer

-(CH2-CH(CH2F))-; poly(3-fluoropropene)

Also accept: -(CH2-CH(CH2F))-; poly(3-fluoropropene); -[CH2-CH(CH2F)]-; poly(3-fluoropropene)

Common mistakes: Keeping the double bond in the repeat unit; Incorrect placement of the fluorine; Omitting the (CH2F) side group

Show mark scheme and worked solution

Marking points

B1 · 1 mark · Correct repeat unit written as -(CH2-CH(CH2F))- or equivalent structure.

B2 · 1 mark · Correct name: poly(3-fluoropropene).

Worked solution

The double bond in CH2=CHCH2F breaks, giving a repeat unit:

The polymer is called poly(3-fluoropropene).