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Chemistry Question on Haloalkanes and Haloarenes

The organic chloro compound, which shows complete sterochemical inversion during a SN2 {S_{N^2}} reaction, is

A

\ce(C2H5)2CHCl\ce{(C2H5)2CHCl}

B

\ce(CH3)3CCl\ce{(CH3)3CCl}

C

\ce(CH3)2CHCl\ce{(CH3)2 CHCl}

D

\ceCH3Cl\ce{CH3Cl}

Answer

\ceCH3Cl\ce{CH3Cl}

Explanation

Solution

SN2S_{N^2} reaction is favoured by small groups on the carbon atom attached to halogen. So, the order of reactivity is CH3Cl>(CH3)2CHCl>(CH3)3CCl>(C2H2)2CHCl {CH3Cl > (CH3 ) 2CHCl > (CH3 ) 3CCl > (C_2H_2)_2 CHCl}