Chain growth polymerization may
proceed by the following mechanism

Options

A. Condensation polymerization
B. Cationic polymerization
C. Anionic polymerization
D. Free radical polymerization

Answer

B, C, D

Explanation

In chain growth polymerization, the mechanism is either free radical or ionic.
Free radical mechanism Initiation
`R-overset(O)overset(||)(C)-O-O-overset(O)overset(||)(C)-R overset(Delta)2R -underset(O)underset(||)(C)-O^(.)`
`R-underset(O)underset(||)(C)-O^(.) to R^(.) +CO_(2)`
Propagation, `R^(.)+ nCH_(2) =CH_(2) to R-CH_(2)-CH_(2)`
`(-CH_(2)-CH_(2)-)_(n) CH_(2) overset(.)(C)H_(2)`
Termination, `overset(.)(R)+overset(.)(R) to R-R `
`2R-CH_(2)CH_(2)-(CH_(2)-CH_(2)-)_(n) CH_(2) overset(.)(C)H_(2) to R-CH_(2)CH_(2)-(-CH_(2)-CH_(2)-)_(n) CH_(2)CH_(2)R`
Ionic
These are initiated by `CuSO_(4).HF` in `H_(2)O` for cationic polymerization .
Initiation `H_(2)SO_(4) H^(+) +F^(-)`
`H^(+) +CH_(2) =CH_(2) to CH_(3) CH_(2) -(CH_(2)-CH_(2)-)_(n)CH_(2)-overset(o+)(C)H_(2)`
Termination

Hence choices (b),(c) and (d) are correct while (a) is incorrect.