Q. Consider the reaction $CH_3-CH_2-CH_2-Br + NaCN \rightarrow CH_3-CH_2-CH_2-CN + NaBr$ The reaction will be the fastest in
A) ethanol
B) methanol
C) N, N'-dimethylformamide (DMF)
D) water
Explanation
[Solution] This $S_N2$ reaction is fastest in a polar aprotic solvent like DMF, which leaves the nucleophile unsolvated. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.