Which compound in each of the following pairs will react faster in `S_(N)2` reaction with `.^(–)OH` ?
(i) `CH_(3)Br or CH_(3)I , (ii) (CH_(3))_(3)C Cl or CH_(3)Cl`

Explanation

To determine which compound in each pair will react faster in an \( S_N2 \) reaction with \( OH^- \) as the nucleophile, we need to analyze the structure of the compounds and the leaving groups involved.

### Step-by-Step Solution:

1. **Identify the Compounds:**
- For the first pair: \( CH_3Br \) (methyl bromide) and \( CH_3I \) (methyl iodide).
- For the second pair: \( (CH_3)_3CCl \) (tert-butyl chloride) and \( CH_3Cl \) (methyl chloride).

...