Species having maximum 'Cl-O' bond order is :

Options

A. `ClO_(3)^(-)`
B. `ClO_(3)`
C. `ClO_(2)`
D. `ClO_(2)^(-)`

Explanation

To determine the species with the maximum 'Cl-O' bond order, we will analyze the bond orders of the given chlorine-oxygen compounds step by step.

### Step 1: Analyze ClO3⁻ (Chlorate ion)
- **Structure**: ClO3⁻ has one chlorine atom bonded to three oxygen atoms. The Lewis structure shows one single bond and two double bonds to oxygen.
- **Bond Order Calculation**:
- Total bonds = 1 (single bond) + 2 (double bonds) = 5
- Number of oxygen atoms = 3
- Bond order = Total bonds / Number of oxygen atoms = 5 / 3 = 1.67

### Step 2: Analyze ClO3 (Chlorine trioxide)
- **Structure**: ClO3 has one chlorine atom bonded to three oxygen atoms with three double bonds.
- **Bond Order Calculation**:
- Total bonds = 3 (double bonds) = 6
- Number of oxygen atoms = 3
- Bond order = Total bonds / Number of oxygen atoms = 6 / 3 = 2.0

### Step 3: Analyze ClO2 (Chlorine dioxide)
- **Structure**: ClO2 has one chlorine atom bonded to two oxygen atoms, with one double bond and one single bond.
- **Bond Order Calculation**:
- Total bonds = 1 (single bond) + 1 (double bond) = 3
- Number of oxygen atoms = 2
- Bond order = Total bonds / Number of oxygen atoms = 3 / 2 = 1.5

### Step 4: Analyze ClO2⁻ (Chlorite ion)
- **Structure**: ClO2⁻ has one chlorine atom bonded to two oxygen atoms, with one double bond and one single bond, plus an additional electron.
- **Bond Order Calculation**:
- Total bonds = 1 (single bond) + 1 (double bond) = 3
- Number of oxygen atoms = 2
- Bond order = Total bonds / Number of oxygen atoms = 3 / 2 = 1.5

### Conclusion
After calculating the bond orders for all species:
- ClO3⁻: 1.67
- ClO3: 2.0
- ClO2: 1.5
- ClO2⁻: 1.5

The species with the maximum 'Cl-O' bond order is **ClO3** with a bond order of **2.0**.