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Nucleophilic substitution reactions are of two types; substitution nucleophilic bimolecular (SN²) and substitution nucleophilic unimolecular (SN¹) depending on molecules taking part in determining the rate of reaction. Reactivity of alkyl halide towards SN¹ and SN² reactions depends on various factors such as steric hindrance, stability of intermediate or transition state and polarity of solvent. SN² reaction mechanism is favoured mostly by primary alkyl halide then secondary and then tertiary. This order is reversed in case of SN¹ reactions.

Isopropyl chloride undergoes hydrolysis by