What is the order of reactivity of alkyl halides with ammonia?

Step-by-step solution

Reactivity of alkyl halides with ammonia depends on nucleophilic substitution mechanisms, where ammonia acts as a nucleophile. The key factor is the leaving group ability of the halide ion. Leaving group ability is inversely related to basicity. Comparing halides: iodine is the weakest base and thus the best leaving group, followed by bromine and then chlorine. This gives the order I - > Br - > Cl - for leaving group quality. Consequently, alkyl halide reactivity follows: R - I > R - B > R - Cl . Evaluating the opt