Consider the reaction CH₃CH₂CH₂Br + NaCN → CH₃CH₂CH₂CN + NaBr. This reaction will be the fastest in

27 2016 Phase II Haloalkanes and Haloarenes SN2 reactions – solvent effect Medium

Consider the reaction $CH_3CH_2CH_2Br + NaCN \rightarrow CH_3CH_2CH_2CN + NaBr$. This reaction will be the fastest in

A N,N'-dimethylformamide (DMF)

B water

C ethanol

D methanol

Explanation

Polar aprotic solvents speed up $S_N2$.

This reaction follows the $S_N2$ path, which is favoured by polar aprotic solvents like DMF, DMSO etc.
DMF (dimethylformamide) = H–CO–N(Me)₂

39 questions from this chapter have appeared across 16 exam years.