The leaving group ability of halide ions...

The leaving group ability of halide ions for `S_(N)2` reaction is

`Cl^(-)gtF^(-)gtBr^(-)gtl^(-)`

`l^(-)gtBr^(-)gtCl^(-)gtF^(-)`

`Cl^(-)gtF^(-)gtl^(-)gtBr^(-)`

`Br^(-)gtl^(-)gtF^(-)gtCl^(-)`

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The correct Answer is:

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The order of reactivities of the following alkyl halides for a S_N^2 reactions is:

RF`gt`RCl`gt`RBr`gt`RI

RF`gt`RBr`gt`RCl`gt`RI

RCl`gt`RBr`gt`RF`gt`RI

RI`gt`RBr`gt`RCl`gt`RF

Methyl chloride

Ethyl chloride

Isobutyl chloride

Tert-butyl chloride

`RF gt RCI gt RBr gt RI`

`RF gt RBr gt RCl gt RI`

`RCl gt RBr gt RI`

`RI gt RBr gt RCl gt RF`