JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pl022
Which statements about cationic addition polymerisation are correct?
AMonomers with electron-donating substituents, such as 2-methylpropene, are suitable
BIt can be started by a Lewis acid such as BFX3 together with a trace of water
CAcrylonitrile is an ideal monomer for it
DThe growing chain end is a carbocation
Answer: A, B, D
Cationic polymerisation proceeds through carbocation chain ends, started by BFX3/water, and needs groups that stabilise a positive charge. Acrylonitrile has an electron-withdrawing CN and is polymerised anionically or by radicals.