Haloalkanes and Haloarenes - Result Question 10
####10. In an $S_N 2$ substitution reaction of the type
$R-Br+Cl^{-} \xrightarrow{DMF} R-Cl+Br^{-}$
[2008] which one of the following has the highest reactivity rate? (a) $CH_3-CH_2-CH_2 Br$
(b)
(c)
(d) $CH_3 CH_2 Br$
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Solution:
- (d) $S_N 2$ mechanism is followed in case of primary and secondary halides i.e., $S_N 2$ reaction is favoured by small groups on the carbon atom attached to halogens so reactivity order is:
i.e. option (d) is correct.
