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Question

Which of the following nucleophiles is going to promote an SN2 reaction?
1022557_4a202f4effb64830ab71d8f7fd7c4dcc.png

A
NaI
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B
Water
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C
NH4Cl
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D
MeONa
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Solution

The correct option is A NaI

The SN2 reactions tend to proceed with strong nucleophiles; by this, generally means negatively charged nucleophiles such as I,CH3O,CN,RS,N3,HO, and others.

The SN1 tends to proceed with weak nucleophiles – generally neutral compounds such as solvents like CH3OH,H2O,CH3CH2OH

In the given options only NaI has I a negative nucleophile.So NaI promotes SN2 reaction mechanism.

Hence option A is correct.


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