The reactivity of alkyl bromides. (A) CH3CH2Br (B) CH3−C|CH3H−Br (C) CH3−CH3|C|CH3−Br (D) CH3Br.
A
D> A> B > C
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B
A> D > B > C
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C
C> B > A > D
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D
C > B > D > A
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Solution
The correct option is B D> A> B > C The reactivity of alkyl bromides (A) CH3CH2Br (B) CH3−C|CH3H−Br (C) CH3−CH3|C|CH3−Br (D) CH3Br towards nucleophilic substituiton reaction follows the order D> A> B > C or CH3Br>CH3CH2Br>CH3−C|BrH−CH3>CH3−CH3|C|CH3−Br. More hindered (more substituted) C atom cannot be easily approached by a nucleophile. Hence such alkyl halide will have lower reactivity.