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The correct order of reactivity of the f...

The correct order of reactivity of the following compounds towards aqueous NaCN will be
I
II. `CH_(2) = CH - CH_(2)- Cl`
III. `CH_(3) - overset(Cl)overset(|)(CH) - CH_(3)" "` IV. `CH_(2) = CH -CH_(2) - `Br

A

I `gt` II `gt` III `gt` IV

B

I `gt` IV `gt` II `gt` III

C

`IV gt` II `gt` I `gt` III

D

`IV gt` II `gt` III `gt` I

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The correct Answer is:
D
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