For the following compound, the correct statements(s) with respect to nucleophilic substitution reactions is (are)

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I and II follow $S_{N} 2$ mechanism

Compound IV undergoes inversion of configuration

The order of reactivity for I, III, and IV is : IV > I > III

I and III follow $S_{N} 1$ mechanism.

answer is A, B, D.

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Detailed Solution

a) Compounds I and II are 1⁰alkyl halides, then they undergo $S_{N} 2$ mechanism
b) Compound IV undergoes inversion of configuration due to intimate – ion pair formation. Inversion predominates over retention.
c) Stability of carbonation follows the order : 2⁰benzylic > 3⁰ alkyls > 1⁰benzylic
(IV) > (III) >(I)
d) I is a benzylic halide, thus, it undergoes $S_{N} 1$ reaction easily as benzylic carbcation is resonance stabilized, III also follows $S_{N} 1$ mechanism as it a 30 alkyl halide