Classify the following reactions in one of the reaction type studied in this unit.
`CH_3CH_2 Br + HS^(-) to CH_3 CH_2 SH`

Explanation

To classify the reaction \( \text{CH}_3\text{CH}_2\text{Br} + \text{HS}^- \rightarrow \text{CH}_3\text{CH}_2\text{SH} + \text{Br}^- \), we can follow these steps:

### Step 1: Identify the Reactants and Products
- The reactants are ethyl bromide (\( \text{CH}_3\text{CH}_2\text{Br} \)) and the nucleophile (\( \text{HS}^- \)).
- The product formed is ethyl thiol (\( \text{CH}_3\text{CH}_2\text{SH} \)) and bromide ion (\( \text{Br}^- \)).

### Step 2: Determine the Role of Each Reactant
- The \( \text{HS}^- \) ion is a nucleophile because it has a negative charge and can donate a pair of electrons.
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