Assertion (A)Glycine exists as Zwitterion.
Reason ( R) It behaves as Lowry-Bronsted acid and base.

Options

A. Both assertion and Reason are correct , and Reason is the correct explanation of Assertion.
B. Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
C. Assertion is correct but Reason is incorrect.
D. Assertion is incorrect but Reason is correct.

Answer

To solve the assertion and reason question regarding glycine, we will analyze both statements step by step.

### Step 1: Understanding the Assertion
**Assertion (A)**: Glycine exists as a zwitterion.

- Glycine is the simplest amino acid, and it contains both an amino group (-NH2) and a carboxyl group (-COOH).
- In solution, glycine can exist in a form where the carboxyl group donates a proton (H+) and becomes negatively charged (-COO^-), while the amino group accepts a proton and becomes positively charged (-NH3^+).
- This results in a molecule that has both a positive and a negative charge, making it a zwitterion.

### Step 2: Understanding the Reason
**Reason (R)**: It behaves as a Lowry-Bronsted acid and base.

- According to the Lowry-Bronsted theory, an acid is a substance that can donate a proton (H+), and a base is a substance that can accept a proton.
- In the case of glycine:
- The carboxyl group acts as an acid by donating a proton (H+) and becoming negatively charged.
- The amino group acts as a base by accepting a proton (H+) and becoming positively charged.
- Therefore, glycine indeed behaves as both an acid and a base.

### Step 3: Conclusion
- Since both the assertion that glycine exists as a zwitterion and the reason that it behaves as a Lowry-Bronsted acid and base are correct, we can conclude that:
- **Assertion (A) is true.**
- **Reason (R) is true and provides a correct explanation for (A).**

Thus, the final answer is that both the assertion and reason are correct, and the reason is the correct explanation of the assertion.