Which of the following statements regarding ozone is not correct

Options

A. The ozone molecule is angular in shape
B. The ozone is resonance hybrid of two structures
C. The oxygen- oxygen bond length in ozone is identical with that of molecular oxygen
D. Ozone is used as a germicides and disinfectant for the purification of air

Explanation

To determine which statement regarding ozone is not correct, we will analyze each statement one by one based on the properties and characteristics of ozone (O₃).

### Step-by-Step Solution:

1. **Understanding Ozone Structure**:
- Ozone (O₃) is a molecule made up of three oxygen atoms. It has a bent or angular shape due to the presence of lone pairs on the central oxygen atom.
- The bond angles in ozone are approximately 117 degrees, which confirms its angular shape.

**Hint**: Recall the VSEPR theory to understand the shape of molecules based on lone pairs and bond pairs.

2. **Resonance in Ozone**:
- Ozone exhibits resonance, meaning it can be represented by multiple structures. The actual structure is a hybrid of these resonance forms.
- The resonance structures involve the shifting of double bonds and charges among the oxygen atoms.

**Hint**: Remember that resonance structures help to describe the delocalization of electrons in a molecule.

3. **Bond Length Comparison**:
- The bond lengths in ozone are not identical to that of molecular oxygen (O₂). In O₂, the bond order is 2 (double bond), while in ozone, the bond order is 1.5 due to resonance.
- This difference in bond order results in a longer bond length in ozone compared to the double bond in O₂.

**Hint**: Compare bond orders to understand the relationship between bond length and bond strength.

4. **Uses of Ozone**:
- Ozone is indeed used as a germicide and disinfectant for air purification. This statement is correct based on its properties as a strong oxidizing agent.

**Hint**: Consider the applications of ozone in environmental science and public health.

5. **Identifying the Incorrect Statement**:
- Now, we summarize the statements:
- **Statement 1**: Ozone molecule is angular in shape. (Correct)
- **Statement 2**: Ozone exhibits resonance. (Correct)
- **Statement 3**: Bond length in ozone is identical to that of molecular oxygen. (Incorrect)
- **Statement 4**: Ozone is used as germicides and disinfectants. (Correct)

The incorrect statement is **Statement 3**, which claims that the bond length in ozone is identical to that of molecular oxygen.

### Final Answer:
The statement regarding ozone that is not correct is: **"Bond length in ozone is identical to that of molecular oxygen."**