Which of the following is a correct priority order of functional groups ?

Options

A.
B.
C.
D.

Answer

To determine the correct priority order of functional groups, we need to understand the general hierarchy of functional groups based on their reactivity and importance in organic chemistry. Here's a step-by-step solution to the question:

### Step 1: Identify the Functional Groups
First, we need to identify the functional groups mentioned in the options given in the question. Common functional groups include:
- Carboxylic acids (COOH)
- Sulfonic acids (SO3H)
- Amines (NH2)
- Amides (CONH2)
- Aldehydes (CHO)
- Ketones (C=O)
- Alcohols (OH)
- Esters (COOR)

### Step 2: Understand the Priority Order
The priority order of functional groups is generally as follows (from highest to lowest priority):
1. Carboxylic acids (COOH)
2. Sulfonic acids (SO3H)
3. Esters (COOR)
4. Aldehydes (CHO)
5. Ketones (C=O)
6. Alcohols (OH)
7. Amines (NH2)
8. Amides (CONH2)

### Step 3: Analyze Each Option
Now, we will analyze each option provided in the question to determine if they follow the correct priority order.

- **Option A**: COOH > SO3H > NH2 > Amide
- This is incorrect because Amide (CONH2) has a higher priority than Amine (NH2).

- **Option B**: Aldehyde > Ketone > OH > NH2
- This is correct because Aldehydes have a higher priority than Ketones, and Alcohols (OH) have a higher priority than Amines (NH2).

- **Option C**: SO3H > COOR > Aldehyde > OH
- This is incorrect because Aldehydes (CHO) have a higher priority than Sulfonic acids (SO3H).

- **Option D**: Incorrect order as well, as it does not follow the established priority.

### Step 4: Conclusion
After analyzing all the options, we conclude that the only correct priority order of functional groups is **Option B**: Aldehyde > Ketone > OH > NH2.