A polymer used in flexible tubing has the repeating unit [−CH2−C(CH3)2−]n\left[{-}\mathrm{CH}_{2}{-}\mathrm{C}(\mathrm{CH}_{3})_{2}{-}\right]_{n}[−CH2−C(CH3)2−]n. A technician proposes that propene, CH2=CHCH3\mathrm{CH}_{2}{=}\mathrm{CHCH}_{3}CH2=CHCH3, was used to make it.
Explain whether the technician's proposal is consistent with the repeating unit, and give the structural formula of a monomer that is consistent with it.
131 exam-style questions on OCR GCSE Chemistry 6.2 Organic chemistry, covering 6.2.1 Crude oil and fractional distillation, 6.2.2 Cracking and dependence on hydrocarbons, 6.2.3 Functional groups and homologous series, 6.2.4 Reactions of alkanes, alkenes and alcohols, 6.2.5 Addition polymerisation and repeat units, 6.2.6 Naturally occurring polymers, 6.2.7 Chemical cells and fuel cells, and 6.2.8 Condensation polymerisation and how to make one. Each one has a worked solution and a mark scheme showing where the marks go.