What is the chemical reaction associated with the hydrogenation of oils ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Hydrogenation:**
- Hydrogenation is a chemical reaction that involves the addition of hydrogen (H₂) to an unsaturated compound, typically an alkene or alkyne, to convert it into a saturated compound. In the context of oils, this means converting liquid vegetable oils (which contain double bonds) into solid or semi-solid fats (which do not contain double bonds).

2. **Identifying the Unsaturated Hydrocarbon:**
- The unsaturated hydrocarbon can be represented as R-CH=CH-R', where R and R' are hydrocarbon chains or groups. The double bond (C=C) indicates that the compound is unsaturated.

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