which statement is/are correct for this ...

which statement is/are correct for this reaction?
(I) polarity of solvent decreases then rate of reaction increases.
strong nucleophilie is more suitable for this reaction.
(III) if R is bulky then carbocation become more stable.
(iv) racemisation take place in this reaction.

A

I and II

B

II and IV

C

I,II and IV

D

III and IV

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