Which of the following nucleophiles is going to promote an $S N_{2}$ reaction?

N a I

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Water

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{N H}_{4} C l

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M e O N a

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Solution

The correct option is B $N a I$
The correct order of strength of nucleophilies mentioned above is:
$C H_{3} O N a > N a I > N H_{4} C l > H_{2} O$
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 $N a I$ is better nucleophile than $M e O N a$

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