The correct order of basic strength is

Options

A. `Cl_(2)O_(7)ltSO_(3)ltP_(4)O_(10)`
B. `NO_(2)ltClO_(2)ltCO_(2)`
C. `Al_(2)O_(3)ltCaOltMgO`
D. None of the above

Answer

To determine the correct order of basic strength among various compounds, we need to consider the factors that influence basicity, such as the oxidation state of the central atom, the size of the central atom, and its electronegativity.

### Step-by-Step Solution:

1. **Identify the Compounds**:
We need to analyze the given compounds for their basic strength. The compounds mentioned in the video are:
- \( \text{Cl}_2\text{O}_7 \) (Chlorine in +7 oxidation state)
- \( \text{SO}_3 \) (Sulfur in +6 oxidation state)
- \( \text{P}_4\text{O}_{10} \) (Phosphorus in +5 oxidation state)

2. **Understand Basicity**:
Basic strength generally increases with:
- Decrease in electronegativity of the central atom.
- Decrease in oxidation state of the central atom.
- Increase in size of the central atom.

3. **Analyze the Oxidation States**:
- \( \text{Cl}_2\text{O}_7 \) has chlorine in a +7 oxidation state, which is relatively high.
- \( \text{SO}_3 \) has sulfur in a +6 oxidation state.
- \( \text{P}_4\text{O}_{10} \) has phosphorus in a +5 oxidation state.

As the oxidation state decreases, the basicity increases.

4. **Compare the Compounds**:
- Since \( \text{Cl}_2\text{O}_7 \) has the highest oxidation state, it will be the least basic.
- \( \text{SO}_3 \) is next, and \( \text{P}_4\text{O}_{10} \) will be the most basic due to its lowest oxidation state.

5. **Order of Basic Strength**:
Therefore, the order of basic strength based on the oxidation states is:
\[ \text{Cl}_2\text{O}_7 < \text{SO}_3 < \text{P}_4\text{O}_{10} \]

6. **Conclusion**:
The correct order of basic strength is:
\[ \text{Cl}_2\text{O}_7 < \text{SO}_3 < \text{P}_4\text{O}_{10} \]