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10) a) (1) Explain the Sn2 reaction withsuitable example. (3M) |
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Answer» Substitution Nucleophilic bimolecular (SN2) This reaction follows second order kinetics and the rate of reaction depends upon both haloalkane as well as participating nucleophile. Hence this reaction is known as substitution nucleophilic bimolecular reaction. In this reaction, the nucleophile attacks the positively charged carbon and the halogen leaves the group. Both the formation of carbocation and exiting of halogen take place simultaneously. In this process, unlike the SN1 mechanism, the inversion of configuration is observed. Since this reaction requires the approach of the nucleophile to the carbon bearing the leaving group, the presence of bulky substituents on or near the carbon atom has a dramatic inhibiting effect. So opposite to SN1 reaction mechanism, this is favored mostly by primary carbon, then secondary carbon and then tertiary carbon. |
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