A: In Hofmann's bromamide degradation amines formed containing one carbon atom less than carbon atoms present in amide.
R: This reaction occurs through the formation of nitrine intermediate

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

### Step-by-Step Solution:

1. **Understanding the Reaction**:
- The Hofmann bromamide degradation reaction involves the conversion of a primary amide into a primary amine. The key feature of this reaction is that the amine produced contains one carbon atom less than the original amide.

2. **Chemical Reaction**:
- The reaction can be represented as follows:
\[ R-CO-NH_2 + Br_2 + KOH \rightarrow R-NH_2 + K_2CO_3 + KBr + H_2O \]
- Here, \(R-CO-NH_2\) is the primary amide, and \(R-NH_2\) is the primary amine formed.

3. **Mechanism of the Reaction**:
- The mechanism begins with the reaction of the primary amide with bromine (\(Br_2\)) in the presence of potassium hydroxide (\(KOH\)).
- This leads to the formation of an intermediate called acyl nitrene.

4. **Formation of Acyl Nitrene**:
- The primary amide reacts to form a brominated intermediate:
\[ R-C(=O)-NH-Br \]
- In a basic medium, the base abstracts a proton from the nitrogen, leading to the formation of acyl nitrene:
\[ R-C(=O)-N^-(Br) \]
- The bromine leaves as bromide ion (\(Br^-\)), resulting in the acyl nitrene intermediate.

5. **Rearrangement**:
- The acyl nitrene undergoes rearrangement to form an isocyanate:
\[ R-C(=O)-N=C=O \]
- This rearrangement is crucial as it leads to the formation of the product.

6. **Hydrolysis**:
- The isocyanate undergoes hydrolysis in the presence of \(KOH\) to yield the primary amine:
\[ R-NH_2 \]
- This primary amine has one carbon atom less than the original amide.

7. **Conclusion**:
- The assertion is true: in Hofmann's bromamide degradation, the amine formed contains one carbon atom less than the carbon atoms present in the amide.
- The reason is also true: the reaction occurs through the formation of a nitrene intermediate (specifically, acyl nitrene).
- However, the reason does not correctly explain the assertion.

### Final Answer:
Both the assertion and the reason are true, but the reason is not the correct explanation for the assertion. Therefore, the correct option is option 2.

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