Which of the following reaction proceeds via a secondary free radical?

Options

A. `CH_3-CH=CH_2overset(HBr)toCH_(3)-underset(Br)underset(|)(C)H-CH_(3)`
B. `CH_(3)-CH=CH_(2)underset(CH_(3)-CH_(2)-CH_(2)Br)overset(HBr//UVlight)to`
C. `C_(6)H_(6)overset(Br_(2)//FeBr_(3))toC_(6)H_(6)Br`
D. `C_(6)H_(6)overset(Br_(2)//UVlight)toCH_(3)-CH_(2)Br`

Answer

B

Explanation

1-Propane undergoes bromination in the presence of UV light through secondary free radial mechanism as given below.
`H-Broverset(UV)to H +Br,`
`CH_3-CH=CH_2+BrtoCH_3-CH-CH_2Br`
`CH_3CH-CH_2Broverset(H)to CH_3CH_2CH_2Br`