The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is

Options

A. `-CONH_(2),-CHO,-SO_(3)H,-COOH`
B. `-COOH,-SO_(3)H,-CONH_(2),-CHO`
C. `-SO_(3)H,-COOH,-CONH_(2),-CHO`
D. `-CHO,-COOH,-SO_(3)H,-CONH_(2)`

Explanation

To determine the correct decreasing order of priority for functional groups in the IUPAC system of nomenclature, we need to refer to the established hierarchy of functional groups. Here’s a step-by-step solution:

### Step 1: Identify the Functional Groups
First, we need to identify the functional groups that are commonly encountered in organic compounds. Some of the key functional groups include:
- Carboxylic acids (-COOH)
- Sulfonic acids (-SO3H)
- Esters (-COOR)
- Amides (-CONH2)
- Aldehydes (-CHO)
- Ketones (C=O)
- Alcohols (-OH)
- Ethers (R-O-R)

### Step 2: Determine the Priority Order
In the IUPAC nomenclature, functional groups are ranked based on their reactivity and the presence of specific structural features. The general decreasing order of priority for common functional groups is as follows:
1. Carboxylic acids
2. Sulfonic acids
3. Esters
4. Amides
5. Aldehydes
6. Ketones
7. Alcohols
8. Ethers

### Step 3: Analyze the Options
Given the question, we need to check the options provided (though not explicitly listed here). We will look for the option that correctly reflects the priority order we established.

### Step 4: Confirm the Correct Option
From the hierarchy we established, we can confirm that:
- Carboxylic acids have the highest priority.
- Sulfonic acids follow.
- Amides come next.
- Aldehydes have the lowest priority among the functional groups listed.

### Conclusion
The correct decreasing order of priority for the functional groups in the IUPAC system of nomenclature is:
1. Carboxylic acids
2. Sulfonic acids
3. Amides
4. Aldehydes