Removal of `CO_2` from a -COOH group is called decarboxylation.

Answer

**Step-by-Step Solution:**

1. **Understanding Decarboxylation**:
- Decarboxylation is a chemical reaction that involves the removal of a carboxyl group (-COOH) from a molecule, which results in the release of carbon dioxide (CO₂).

2. **Identifying the Reaction**:
- This reaction typically occurs in carboxylic acids. The general structure of a carboxylic acid is represented as R-COOH, where R is a hydrocarbon chain or a hydrogen atom.

3. **Mechanism of Decarboxylation**:
- During decarboxylation, the carboxyl group (-COOH) is converted into a hydrogen atom (H) and carbon dioxide (CO₂).
- The reaction can be represented as:
\[ R-COOH \rightarrow R-H + CO_2 \]
- Here, R-H represents the resulting hydrocarbon after the removal of the carboxyl group.

4. **Example of Decarboxylation**:
- For instance, if we take acetic acid (CH₃COOH) as an example:
\[ CH_3COOH \rightarrow CH_4 + CO_2 \]
- In this reaction, acetic acid loses a carbon dioxide molecule and becomes methane (CH₄).

5. **Conclusion**:
- Therefore, the removal of CO₂ from a carboxylic acid is indeed termed decarboxylation, and it results in the formation of a hydrocarbon.

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