The best method for locating the position of double bond in an unknown alkene is ...............

Explanation

**Step-by-Step Solution:**

1. **Understanding the Problem**: The question asks for the best method to locate the position of a double bond in an unknown alkene.

2. **Identifying the Method**: The method that is most effective for this purpose is ozonolysis. Ozonolysis is a chemical reaction involving the cleavage of alkenes using ozone (O₃).

3. **Reaction Mechanism**: During ozonolysis, the alkene reacts with ozone, leading to the formation of ozonides, which are then typically reduced to carbonyl compounds (aldehydes or ketones) using a reducing agent like zinc in water.

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