Which of the following statement are correct?

Options

A. `alpha`-Amino acids on heating give piperazine (cyclic diamide).
B. `beta`-Amino acids on heating give `alpha,beta`-unsaturated acids.
C. `gamma-`Amino acids on heating give lactam (five-membered cyclic ester).
D. `delta`-Amino acids on heating give lactam (six-membered cyclic ester).

Answer

To determine which statements are correct regarding the heating effect of amino acids, we will analyze each type of amino acid mentioned in the question: alpha, beta, gamma, and delta amino acids.

### Step-by-Step Solution:

1. **Understanding Alpha Amino Acids**:
- An alpha amino acid has the general structure R-CH(NH2)-COOH.
- Upon heating, two molecules of water are released, leading to the formation of a cyclic amide known as **Piperazine**.
- **Conclusion**: The statement about alpha amino acids forming a cyclic amide is correct.

2. **Understanding Beta Amino Acids**:
- A beta amino acid has the structure R-CH2-CH(NH2)-COOH.
- When heated, it releases ammonia (NH3) and forms an **alpha-beta unsaturated acid**.
- **Conclusion**: The statement about beta amino acids forming alpha-beta unsaturated acids is correct.

3. **Understanding Gamma Amino Acids**:
- A gamma amino acid has the structure R-CH2-CH2-CH(NH2)-COOH.
- Upon heating, it releases ammonia and forms a cyclic compound known as **gamma Lactam**.
- **Conclusion**: The statement about gamma amino acids forming gamma Lactam is correct.

4. **Understanding Delta Amino Acids**:
- A delta amino acid has the structure R-CH2-CH2-CH2-CH(NH2)-COOH.
- When heated, it also releases ammonia and forms a cyclic compound known as **delta Lactam**.
- **Conclusion**: The statement about delta amino acids forming delta Lactam is correct.

5. **Final Evaluation**:
- All statements regarding the heating effects of alpha, beta, gamma, and delta amino acids are correct.

### Summary of Correct Statements:
- Alpha amino acids form cyclic amides (Piperazine).
- Beta amino acids yield alpha-beta unsaturated acids.
- Gamma amino acids produce gamma Lactam.
- Delta amino acids generate delta Lactam.