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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 compounds can form Grignand reagent on reaction with mg/ether

A

B

C

D

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The correct Answer is:
C

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