In a nucleophilic substitution reaction :

R -Br+Cl^{-}\: \: DMF\rightarrow R-Cl+Br^{-}

which one of the following undergoes complete inversion of configuration ?  

 

  • Option 1)

     C6H5CHC6H5Br   
     

  • Option 2)

    C6H5CH2Br   
     

  • Option 3)

     C6H5CH CH3Br   
     

  • Option 4)

    C6H5CCH3C6H5Br   

 

Answers (1)
V Vakul

As we learnt in 

Negatively charged Nucleophile - - wherein

OH^{-},CH_{3}^{-},NH_{2}^{-},R-O^{-}

 

 It is a S_{N}2 type reaction which requires less crowded substance. Among the given option C_{6}H_{5}-CH_{2}-Br is least crowded substrate.


Option 1)

 C6H5CHC6H5Br   
 

This option is incorrect

Option 2)

C6H5CH2Br   
 

This option is correct

Option 3)

 C6H5CH CH3Br   
 

This option is incorrect

Option 4)

C6H5CCH3C6H5Br   

This option is incorrect

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