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# Chain transfer reagent is

$\begin {array} {1 1} (a)\;CCl_4 & \quad (b)\;O_2 \\ (c)\;CH_4 & \quad (d)\;H_2 \end {array}$

$P• + XR' \rightarrow PX + R'•$: Chain transfer is a polymerization reaction by which the activity of a growing polymer chain is