Assertion (A) : Hofmann bromamide reaction takes place btween an arthide and `Br_2` in basic medium .
Reason (R ). The reaction proceeds by the formation of `(R-overlineN: )` nitrene intremediate.

Options

A. If both (A) and (R ) ar true, and (R ) is the correct explanation of (A).
B. If both (A) and (R ) are true , and (R ) is not the correct explanation of (A).
C. If (A) is true , but (R ) is false .
D. If both (A) and (R ) are false .

Explanation

To solve the question regarding the Hofmann bromamide reaction, we will analyze the assertion and reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that the Hofmann bromamide reaction takes place between an amide and bromine in a basic medium.
- This is indeed true. The Hofmann bromamide reaction involves the reaction of an amide with bromine (Br2) in the presence of a base (like KOH) to produce a primary amine with one less carbon atom.

2. **Mechanism of the Reaction**:
- The reaction begins with the deprotonation of the amide nitrogen by the hydroxide ion (OH-) from the basic medium. This forms a negatively charged nitrogen species.
- The bromine molecule (Br2) then reacts with this negatively charged nitrogen, forming an electrophile that will lead to the formation of an isocyanate intermediate.

3. **Formation of the Intermediate**:
- The intermediate formed during this reaction is not a nitrene but rather an isocyanate (R-N=C=O). This is a key point that distinguishes the assertion from the reason.
- The reaction continues with the isocyanate being hydrolyzed to yield a primary amine (RNH2) and carbon dioxide (CO2).

4. **Understanding the Reason**:
- The reason states that the reaction proceeds by the formation of a nitrene intermediate.
- This is incorrect because the intermediate formed is an isocyanate, not a nitrene. Therefore, the reason is false.

5. **Conclusion**:
- The assertion is true, while the reason is false. Thus, the correct answer to the question is that the assertion is true and the reason is false.

### Final Answer:
- Assertion (A) is true.
- Reason (R) is false.
- Therefore, the answer is option C: Assertion true, Reason false.