Arrange the following halides in order of increasing `S_(N)2` reactivity:
`(CH_(3))_(3)C Cl, CH_(3)Cl, CH_(3)Br, CH_(3)CH_(2)Cl, (CH_(3))_(2)CHCI`

Explanation

To arrange the given halides in order of increasing `S_N2` reactivity, we need to consider two main factors: the steric hindrance around the carbon atom bonded to the halogen and the leaving ability of the halide group. The general trend for `S_N2` reactions is that primary halides react faster than secondary halides, and tertiary halides do not undergo `S_N2` reactions due to steric hindrance.

### Step-by-Step Solution:

1. **Identify the Halides**: The halides given are:
- (CH₃)₃CCl (tert-butyl chloride)
- CH₃Cl (methyl chloride)
- CH₃Br (methyl bromide)
...