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Explain the mechanism involved n bimolecular nucleophilic substitution reaction. |
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Answer» Solution :`S_(N)2` MECHANISM: (i) The rate of `S_(N)2` reaction depends upon the concentration of both alkyl halide and the nucleophile. (ii) Rate of reaction `=k_(2)` [alkylhalide] [nucleophile]. If follows second order kinetics and occurs in one step. (iii) This reaction involves the formation of a transition state in which both the reactant molecules are partially bonded to each other. the ATTACH of nucleophile occurs from the back side (i.e., opposite to the side in which the halogen is attacked). (iv) The carbon at which substitution occurs has inverted CONFIGURATION durig the course of reaction just as an umbrella has tendency to invert in a wind storm. this inversion of configuration is called walden inversion, after paul walden who RST discovered the inversion of configuration of a COMPOUND in `S_(N)2` reaction. (v) `S_(N)2` reaction of an optically active haloalkane is always accompanied by inversion of configuration at the asymmetric centre. |
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