2-4 dinitroaniline is treated with ` NaNO_(2)` and dilute HCI at 280 K followed by reaction with anisole , forming a coloured compound . The structure of this coloured compound would be :

Options

A.
B.
C.
D.

Answer

To solve the problem, we need to follow a series of steps that involve understanding the reactions taking place and the structures of the compounds involved. Here’s a step-by-step breakdown:

### Step 1: Identify the starting compound
The starting compound is **2,4-dinitroaniline**. Its structure can be represented as follows:
- Aniline (C6H5NH2) has an amino group (NH2) attached to a benzene ring.
- The nitro groups (NO2) are attached at the 2 and 4 positions of the benzene ring.

**Structure of 2,4-dinitroaniline:**
```
NO2
|
C6H3(NH2)
|
NO2
```

### Step 2: Diazotization reaction
When 2,4-dinitroaniline is treated with **NaNO2** and **dilute HCl**, it undergoes a diazotization reaction. The amino group (NH2) is converted into a diazonium ion (N2+), resulting in the formation of **2,4-dinitroanilinium ion**.

**Structure of 2,4-dinitroanilinium ion:**
```
NO2
|
C6H3(N2+)
|
NO2
```

### Step 3: Electrophilic substitution with anisole
Next, the diazonium ion reacts with **anisole** (C6H5OCH3). Anisole acts as an electrophile due to the electron-donating effect of the methoxy group (OCH3), which increases the electron density at the ortho and para positions of the benzene ring.

### Step 4: Determine the possible products
The electrophilic substitution can occur at the ortho or para positions relative to the methoxy group. However, due to steric hindrance and the presence of the nitro groups, the para position is more favorable.

**Possible structures:**
1. **Para product:**
- The para product will have the diazonium group at the para position relative to the methoxy group.

**Structure of the para product:**
```
NO2
|
C6H3(N=N-OCH3)
|
NO2
```

2. **Ortho product:**
- The ortho product would have the diazonium group at the ortho position, but it is less stable due to steric hindrance from the bulky nitro groups.

### Step 5: Conclusion
The colored compound formed from the reaction of 2,4-dinitroaniline with anisole is the **para-substituted product**, which is more stable than the ortho product.

### Final Structure of the colored compound:
```
NO2
|
C6H3(N=N-OCH3)
|
NO2
```