In a nucleophilic substitution reaction : R - Br + Cl - ⟶ DMF R - Cl + Br - , which one of the…

In a nucleophilic substitution reaction :  R - Br + Cl - ⟶ DMF R - Cl + Br - ,  which one of the following undergoes complete inversion of configuration ?
  1. C6H5CHC6H5Br
  2. C6H5CCH3C6H5Br
  3. C6H5CH2Br
  4. C6H5CH2CH2Br

Solution

In SN2 (nucleophilic bimolecular substitution) inversion takes place

SN2∝1stearic hindrance

Rate of R–X is 1° > 2° > 3°

Asked in: JEE Main 2014 (09 Apr Online)

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