Identify the correct decreasing order of reactivity of alkyl halide with ammonia?

1. $\mathrm{R}-\mathrm{I}>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{Cl}$
2. $\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{I}$
3. $\mathrm{R}-\mathrm{I}>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{Br}$
4. $\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{I}$

Solution

Decreasing order of strength of $\mathrm{C}-\mathrm{X}$ bond is

Asked in: MHT CET 2020 (20 Oct Shift 2)

Practice more Halogen Derivatives questions on Aicharya