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  4. In which of the following, homolytic bond fission takes place ?

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Q. In which of the following, homolytic bond fission takes place ?

KCETKCET 2017Organic Chemistry – Some Basic Principles and Techniques

Solution:

Free radical chlorination of methane Initiation
(1) $Cl_2 \xrightarrow{\text{Light}} 2Cl^{\bullet}$
Propagation
(2) $ Cl + CH_4 \rightarrow HCl + \overset{\bullet}{C}H_3$
(3)$CH_3 + Cl_2 \rightarrow CH_3Cl + Cl^{\bullet}$
Termination
(4) $2Cl^{\bullet} \rightarrow Cl_2$
$Cl \bullet + \bullet CH_3 \rightarrow CH_3Cl$
$2. CH_3 \rightarrow CH_3CH_3$