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Solution


Q.

Consider the reaction,

CH3CH2CH2Br+NaCN→CH3CH2CH2CN+NaBr

This reaction will be the fastest in                        [2016]
1 ethanol  
2 methanol  
3 N, N′-dimethylformamide (DMF)  
4 water  

Ans.

(3)

The reaction,

CH3CH2CH2Br+NaCN ⟶ CH3CH2CH2CN+NaBr

follows SN2 mechanism which is favoured by polar aprotic solvent i.e., N, N' -dimethylformamide (DMF),