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(R ) -hexan -2-ol overset("conc.HX ") ra...

`(R )` -hexan -`2-ol overset("conc.HX ") rarr`
under `S_(N)2` conditions the product is

A

`100% (R )` -halide

B

`100%(S)`-halide

C

`75%(R )` and `25%(S)`

D

`75%(S)` and `(25%) (R )` halide

Text Solution

Verified by Experts

The correct Answer is:
B
Under `S_(N)2` conditions , the slow step is concerted and at no time does a carbocation form. The `X^(-)` bonds to the back side of the `C`, away from the departing `H_(2)O`, resulting in an `100%` inversion.
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