State how the following conversions can be carried out:
Ethyl chloride to ethene.

Explanation

To convert ethyl chloride (CH3CH2Cl) to ethene (CH2=CH2), we can perform a dehydrohalogenation reaction. This process involves the removal of a hydrogen halide (HCl in this case) from the alkyl halide. Here’s a step-by-step breakdown of how this conversion can be achieved:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The starting compound is ethyl chloride (CH3CH2Cl).

2. **Choose the Reagent**:
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