A: Urethane on reaction with anmonia gives urea.
R: Formula of urethane is
`NH_(2)-overset(O)overset(||)C-NH-OCH_(2)CH_(3)`

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
C. If Assertion is true statement but Reason is false, then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
The assertion states that "urethane on reaction with ammonia gives urea."
- Urethane is an organic compound that can undergo a reaction with ammonia.

2. **Identifying the Reaction**:
- When urethane reacts with ammonia, it typically undergoes hydrolysis, leading to the formation of urea and another product.
- The reaction can be represented as:
\[ \text{Urethane} + \text{Ammonia} \rightarrow \text{Urea} + \text{Ethanol} \]
- The product urea has the formula \( \text{NH}_2\text{C}(=O)\text{NH}_2 \).

3. **Understanding the Structure of Urethane**:
- The reason provided states that the formula of urethane is \( \text{NH}_2-\overset{O}{\overset{||}{C}}-\text{NH}-\text{OCH}_2\text{CH}_3 \).
- However, the correct structure of urethane is:
\[ \text{NH}_2-\overset{O}{\overset{||}{C}}-\text{O}-\text{CH}_2\text{CH}_3 \]
- This indicates that the reason given is incorrect.

4. **Conclusion**:
- Since the assertion is true (urethane does react with ammonia to give urea), but the reason is false (the structure of urethane is incorrectly stated), we conclude that:
- The assertion is true.
- The reason is false.

5. **Final Answer**:
- The correct option is that the assertion is true but the reason is false.