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R - X + Mg overset("ether". Delta)(to) o...

`R - X + Mg overset("ether". Delta)(to) overset(delta-)( R) - overset(delta+)(Mg) X`
Grignand reagent may be prepared from `1^@, 2^@` and ` 3^@` halides as well as from Vinyl and Aryl halide, vicinal dihalides are those halides which contain acidic tail do not form Grignand reagent.
Which of the following halide is most reactive for preparation of Grignand reagent

A

B

C

D

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The correct Answer is:
D
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