The number of resonating structures of aniline is :-

Options

A. 2
B. 3
C. 4
D. 5

Answer

To determine the number of resonating structures of aniline, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Aniline**:
Aniline is an aromatic amine with the formula C6H5NH2. Its structure consists of a benzene ring (C6H5) attached to an amino group (NH2).

2. **Identify the Delocalization of Electrons**:
In aniline, the lone pair of electrons on the nitrogen atom can participate in resonance with the π electrons of the benzene ring. This delocalization is key to forming different resonating structures.

3. **Draw the First Resonating Structure**:
The first structure is the basic structure of aniline where the nitrogen atom has a lone pair of electrons and is connected to the benzene ring.

4. **Form the Second Resonating Structure**:
In the second structure, the lone pair on the nitrogen can be used to form a double bond with the carbon atom of the benzene ring. This creates a positive charge on the nitrogen atom.

5. **Draw the Third Resonating Structure**:
In the third structure, the double bond can shift to another carbon atom in the benzene ring, while the positive charge remains on the nitrogen.

6. **Continue with Additional Resonating Structures**:
Repeat the process of shifting the double bond and the positive charge to different carbon atoms in the benzene ring. Each time you shift the double bond, you create a new resonating structure.

7. **Count All Unique Resonating Structures**:
After drawing all possible unique structures, count them. For aniline, you will find that there are a total of five distinct resonating structures.

### Final Answer:
The number of resonating structures of aniline is **5**.

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