Question

Which of the following nucleophiles is going to promote an $S{N}_2$ reaction?

• A. $NaI$
• B. Water
• C. ${NH}_{4}Cl$
• D. $MeONa$

Answer 1

Answer: (A)

$NaI$

The correct order of strength of nucleophilies mentioned above is:

$C{H}_{3}ONa>NaI>N{H}_{4}Cl>H_{2}O$

A nucleophile in context of Substitution Nucleophilic reactions ($S{N}_1$ or $S{N}_2$) is stronger when it has more affinity to attach to the positive site.

$S{N}_2$ reaction also depends on steric factor,so $NaI$ is better nucleophile than $MeONa$