Arrange the following in order of their
Increasing reactivity in nucleophilic subsitution reactions : `CH_(3)F, CH_(3)I, CH_(3)Br, CH_(3)Cl`

Explanation

To determine the increasing reactivity of the haloalkanes in nucleophilic substitution reactions, we need to consider the stability of the leaving groups. The leaving group ability is crucial because a better leaving group will facilitate the nucleophilic substitution reaction more effectively.

### Step-by-Step Solution:

1. **Identify the Compounds**: We have four haloalkanes: CH₃F (methyl fluoride), CH₃Cl (methyl chloride), CH₃Br (methyl bromide), and CH₃I (methyl iodide).

2. **Understand Leaving Group Ability**: The reactivity in nucleophilic substitution reactions is influenced by the ability of the leaving group to depart. The order of leaving group ability, from best to worst, is:
- I⁻ (iodide)
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