Mention the industrial application of addition reaction.

Explanation

**Step-by-Step Solution:**

1. **Understanding Addition Reaction**:
- An addition reaction involves the addition of one or more molecules to an unsaturated organic compound. This process typically involves compounds that contain double or triple bonds.

2. **Identifying an Industrial Application**:
- One significant industrial application of addition reactions is the hydrogenation of vegetable oils. This process converts unsaturated vegetable oils into saturated fats, such as vegetable ghee.

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