Question

The group present in prontosil is

• A.
• B.
• C.
• D.

Hint:

Remember: 1. Azo compounds are characterized by -N=N- linkage.
2. Prontosil was the first commercially available antibiotic.
3. In vivo, it breaks down to release sulfanilamide.

Answer 1

The Correct Option is A

Prontosil (the first sulfa drug) contains: - A characteristic azo group (-N=N-) linking two aromatic rings.
- This was the active component that metabolizes to sulfanilamide.
- Structure: Contains -N=N- linkage. Key features: - Azo dyes have -N=N- linkage.
- Options 2-4 don't exist in prontosil. Thus, the correct answer is (1).

Answer 2

Prontosil is a well-known synthetic drug that was historically used as one of the first antibacterial agents. It is classified as a **sulfonamide drug** and is also recognized as a type of **azo dye**. 

A key structural feature of Prontosil is the presence of the **azo group**, which is represented by the linkage: 

–N=N–
The azo group is formed by two nitrogen atoms connected via a double bond, and it typically connects two aromatic rings in azo compounds. This group is responsible for the vivid color of azo dyes and also plays a crucial role in the biological activity of Prontosil. 

Final Answer:
Azo group (–N=N–)