Q.

Consider the reaction,CH3CH2CH2Br+NaCN→CH3CH2CH2CN+NaBrThis reaction will be the fastest in

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a

ethanol water.

b

methanol

c

N,N' -dimethylformamide (DMF)

d

water

answer is C.

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Detailed Solution

The reaction,CH3CH2CH2Br+NaCN→CH3CH2CH2CN+NaBr follows SN2 mechanism which is favoured by polar  aprotic solvent i.e., N,N'- dimethylformamide (DMF).  moreover no rearrangement is observed, it is SN2 mechanism
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Consider the reaction,CH3CH2CH2Br+NaCN→CH3CH2CH2CN+NaBrThis reaction will be the fastest in