Which of the following will undergoes decarboxylatio on heating?

Options

A. Succinic acid
B. Phthalic acid
C. Malonic acid
D. Glutaric acid

Explanation

To determine which of the given compounds will undergo decarboxylation upon heating, we need to identify if any of them are either 1,3-dicarboxylic acids or beta-keto acids, as these types of compounds are known to readily lose carbon dioxide (CO2) during heating.

### Step-by-Step Solution:

1. **Identify the Compounds**: We have four options to analyze:
- Option A: Succinic acid (HOOC-CH2-COOH)
- Option B: Phthalic acid (C6H4(COOH)2)
- Option C: Melonic acid (CH2(COOH)2)
- Option D: Glutamic acid (HOOC-CH2-CH(NH2)-COOH)

2. **Analyze Option A (Succinic Acid)**:
- Structure: HOOC-CH2-COOH
- This is a 1,4-dicarboxylic acid, not a 1,3-dicarboxylic acid or a beta-keto acid.
- Conclusion: **Does not undergo decarboxylation**.

3. **Analyze Option B (Phthalic Acid)**:
- Structure: C6H4(COOH)2
- This is a 1,2-dicarboxylic acid, which does not fit the criteria for decarboxylation.
- Conclusion: **Does not undergo decarboxylation**.

4. **Analyze Option C (Melonic Acid)**:
- Structure: CH2(COOH)2
- This is a 1,3-dicarboxylic acid, which is known to undergo decarboxylation upon heating.
- Conclusion: **Undergoes decarboxylation**.

5. **Analyze Option D (Glutamic Acid)**:
- Structure: HOOC-CH2-CH(NH2)-COOH
- This is not a beta-keto acid nor a 1,3-dicarboxylic acid.
- Conclusion: **Does not undergo decarboxylation**.

### Final Answer:
The compound that will undergo decarboxylation upon heating is **Option C: Melonic Acid**.