Hofmann bromide degradation reaction is shown by

Options

A. `ArNH_2`
B. `ArCONH_2`
C. `ArNO_2`
D. `ArCH_2 NH_2`

Explanation

To solve the question regarding which compound undergoes the Hofmann bromide degradation reaction, we can follow these steps:

### Step 1: Understand the Hofmann Bromide Degradation Reaction
The Hofmann bromide degradation reaction involves the conversion of an amide into a primary amine in the presence of bromine (Br2) and sodium hydroxide (NaOH). The general reaction can be represented as follows:

\[ \text{R-C(=O)-NH}_2 + \text{Br}_2 + \text{NaOH} \rightarrow \text{R-NH}_2 + \text{byproducts} \]

### Step 2: Identify the Structure of Amides
Amides have the general structure of R-C(=O)-NH2, where R is an alkyl or aryl group. This structure is essential for the Hofmann degradation to occur.

### Step 3: Analyze the Given Options
We need to analyze the options provided in the question to determine which one represents an amide that can undergo Hofmann bromide degradation.

1. **Option A:** R-NH2 (This is a primary amine, not an amide)
2. **Option B:** R-C(=O)-NH2 (This is the structure of an amide)
3. **Option C:** R-C(=O)-R' (This is a ketone, not an amide)
4. **Option D:** R-C(=O)-R'' (This is also a ketone, not an amide)

### Step 4: Select the Correct Option
From the analysis, we see that only **Option B (R-C(=O)-NH2)** is an amide that can undergo Hofmann bromide degradation.

Thus, the correct answer is **Option B**.

### Summary of the Solution:
The Hofmann bromide degradation reaction is shown by amides, specifically represented by the structure R-C(=O)-NH2. Among the given options, only Option B fits this criterion.

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