For the following compounds, the correct statement(s) with respect to nucleophilic substitution reaction is(are)

Options

A. Compound IV undergoes inversion of configuration
B. The order of reactivity for I, III and IV is:
IVgtIgtIII
C. I and III follows `S_(N^(1))` mechanism
D. I and II follows `S_(N^(2))` mechanism

Answer

A, C, D

Explanation

Option (a) is correct as compound (iv) undergoes inversion of configuration.
Option (c) is correct because both (I) and (III) can follows `S_(N^(2))` mechanism provided the medium is highly polar as well as protic.
(d). Option (d) is also correct because both I & II can follows `S_(N^(2))` mechanism provided provided the medium is polar aprotic and nucleophile is strong.
(b). Option (b) is not correct because the order of reactivity is not correct for `S_(N^(1))` and `S_(N^(2))` mechanisms.