Assertion : Bond order can assume any value number including zero.
Reason :Higher the bond order ,shorter is bond length and greater is bond energy.

Options

A. If assertion is true but the reason is false
B. If assertion is false but reason is true
C. If both assertion and reason are true and the reason is the correct explanation of assertion
D. If both assertion and reason are true and the reason is not the correct explanation of assertion

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that "Bond order can assume any value number including zero."

- **Bond Order Definition**: Bond order is defined as the difference between the number of bonding electrons and the number of antibonding electrons, divided by two. It indicates the strength and stability of a bond.
- **Possible Values**: Bond order can indeed be zero, which occurs in cases where there are no bonds between atoms. For example, in the case of helium (He2), the bond order is calculated as follows:
- Electronic configuration: 1s² (bonding) and σ*1s² (antibonding).
- Bond order = (Number of bonding electrons - Number of antibonding electrons) / 2 = (2 - 2) / 2 = 0.

Thus, the assertion is **true**.

### Step 2: Understand the Reason
The reason states that "Higher the bond order, shorter is the bond length and greater is bond energy."

- **Bond Order and Bond Length**: Generally, as bond order increases (for example, from single to double to triple bonds), the bond length decreases. This is because more electrons are shared between the atoms, pulling them closer together.
- **Bond Order and Bond Energy**: Similarly, higher bond orders correspond to stronger bonds, which require more energy to break, thus increasing bond energy.

Therefore, the reason is also **true**.

### Step 3: Analyze the Relationship Between Assertion and Reason
While both the assertion and reason are true, we need to determine if the reason correctly explains the assertion.

- The assertion discusses the range of bond order values, including zero, which is explained by the electronic configurations of molecules.
- The reason discusses the relationship between bond order, bond length, and bond energy, which does not directly explain why bond order can be zero.

Thus, while both statements are true, the reason does not correctly explain the assertion.

### Conclusion
The correct answer is that both the assertion and reason are true, but the reason is not the correct explanation for the assertion.

### Final Answer
Both the assertion and reason are true, but the reason is not the correct explanation for the assertion.

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