Which of the following monomer and mode-of-polymerisation pairings is/are suitable? (One or more options may be correct.)

A $CH X_{2} = CH - O - CH X_{3}$ by anionic polymerisation
B $CF X_{2} = CF X_{2}$ by free radical polymerisation
C $CH X_{2} = CH - CN$ by anionic polymerisation
D $CH X_{2} = C (CH X_{3}) X_{2}$ by cationic polymerisation

Answer: B, C, D

The tertiary carbocation from 2-methylpropene suits cationic growth, the nitrile stabilises a carbanion, and tetrafluoroethene polymerises by radicals to PTFE. Methyl vinyl ether has an electron-donating

- OCH X_{3}

group that destabilises a carbanion, so anionic polymerisation is unsuitable.

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