Which of the following is known as inorganic benzene

Options

A. Borazine
B. Boron nitride
C. `p`-dichlorobenzene
D. Phosphonitrilic acid

Answer

To determine which of the given options is known as inorganic benzene, we will analyze each option based on their structures and properties.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- Option 1: Borazine
- Option 2: Boron Nitride
- Option 3: Para-Dichlorobenzene
- Option 4: Phosphonitrilic Acid

2. **Analyze Borazine**:
- Borazine, also known as borazole, has a structure that alternates between boron (B) and nitrogen (N) atoms.
- It exhibits resonance similar to benzene, with alternating double bonds and single bonds.
- Each boron atom is bonded to a hydrogen atom, similar to how carbon atoms in benzene are bonded to hydrogen.
- Due to its structural similarity to benzene, borazine is referred to as "inorganic benzene."

3. **Analyze Boron Nitride**:
- Boron nitride has a structure that can be similar to graphite, consisting of alternating boron and nitrogen atoms.
- It does not have the same resonance characteristics as benzene and is often referred to as "inorganic graphite" instead.

4. **Analyze Para-Dichlorobenzene**:
- Para-dichlorobenzene is a derivative of benzene where two chlorine atoms are substituted at the para position.
- It retains the carbon structure of benzene and does not qualify as inorganic benzene.

5. **Analyze Phosphonitrilic Acid**:
- Phosphonitrilic acid consists of alternating phosphorus and nitrogen atoms.
- While it has some resonance characteristics, it does not resemble benzene's structure and is not referred to as inorganic benzene.

6. **Conclusion**:
- After analyzing all options, it is clear that **borazine** (Option 1) is the compound known as inorganic benzene due to its structural and resonance similarities to benzene.

### Final Answer:
**Option 1: Borazine is known as inorganic benzene.**