5.How many of the following statements is/are correct?
(I) Normally, aryl and vinyI halides are good substrates for SN2 reactions.
(II) SN2 and SN1 reactions prefer protic and aprotic solvents, respectively.
(III) Both E1 and SN1 reactions produce carbocations in their reaction pathways.
(A)0
(B)1
(C)2
(D)3
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