${\rm{C}}{{\rm{H}}_3}{\rm{Br\;}} + {\rm{\;N}}{{\rm{u}}^ - }{\rm{\;}} \to {\rm{C}}{{\rm{H}}_3} - {\rm{Nu}} + {\rm{B}}{{\rm{r}}^ - }$. The decreasing order of the rate of the above reaction with nucleophiles (${\rm{N}}{{\rm{u}}^ - }){\rm{\;}}A{\kern 1pt} {\kern 1pt} {\rm{\;to\;}}{\kern 1pt} {\kern 1pt} D$ is : $\left[ {{\rm{N}}{{\rm{u}}^ - }{\rm{\;}} = {\rm{\;}}\left( A \right){\rm{Ph}}{{\rm{O}}^ - },{\rm{\;}}\left( B \right){\rm{Ac}}{{\rm{O}}^ - },\left( C \right){\rm{H}}{{\rm{O}}^ - },\left( D \right){\rm{C}}{{\rm{H}}_3}{{\rm{O}}^ - }} \right]$

NEET UG CHEMISTRY MCQ: HALOALKANES AND HALO ARENES

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\mathrm{C}{\mathrm{H}_3}\mathrm{Br\;} + \mathrm{\;N}{\mathrm{u}^ - }\mathrm{\;} \to \mathrm{C}{\mathrm{H}_3} - \mathrm{Nu} + \mathrm{B}{\mathrm{r}^ - }

. The decreasing order of the rate of the above reaction with nucleophiles (

\mathrm{N}{\mathrm{u}^ - })\mathrm{\;}A{\kern 1pt} {\kern 1pt} \mathrm{\;to\;}{\kern 1pt} {\kern 1pt} D

is :

\left[ {\mathrm{N}{\mathrm{u}^ - }\mathrm{\;} = \mathrm{\;}\left( A \right)\mathrm{Ph}{\mathrm{O}^ - },\mathrm{\;}\left( B \right)\mathrm{Ac}{\mathrm{O}^ - },\left( C \right)\mathrm{H}{\mathrm{O}^ - },\left( D \right)\mathrm{C}{\mathrm{H}_3}{\mathrm{O}^ - }} \right]

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Correct option: B

D > C > B > A

Option A is correct because the reactivity of nucleophiles in SN2 reactions depends on their basicity and steric hindrance. More basic and less hindered nucleophiles are more reactive.

NEET UG CHEMISTRY MCQ: HALOALKANES AND HALO ARENES

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