What is used as a medium in Wurtz reaction ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Wurtz Reaction**: The Wurtz reaction is a coupling reaction that involves the formation of alkanes from alkyl halides in the presence of sodium metal.

2. **Identifying the Medium**: In the Wurtz reaction, the medium used is dry ether. This is crucial for the reaction to proceed safely and effectively.

3. **Reason for Using Dry Ether**: The reason for using dry ether instead of wet ether is that sodium is a highly reactive alkali metal. If wet ether (which contains water) is used, the sodium can react with water, leading to a vigorous and potentially explosive reaction.

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