Assertion: Bond energy has order like `C-C lt C=C lt C -= C`.
Reason: Bond energy increases with increase in bond order.

Options

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

Explanation

To solve the question regarding the assertion and reason about bond energy and bond order, we can break it down into a step-by-step analysis:

### Step 1: Understand the Assertion
The assertion states that the bond energy order is as follows:
\[ C-C < C=C < C \equiv C \]
This means that the bond energy of a single bond (C-C) is less than that of a double bond (C=C), which in turn is less than that of a triple bond (C≡C).

**Hint:** Recall that bond energy is the energy required to break a bond between two atoms.

### Step 2: Analyze Bond Energy and Bond Order
The reason states that bond energy increases with an increase in bond order. Bond order refers to the number of shared electron pairs between two atoms. For example:
- A single bond (C-C) has a bond order of 1.
- A double bond (C=C) has a bond order of 2.
- A triple bond (C≡C) has a bond order of 3.

As the bond order increases, the number of shared electron pairs increases, leading to stronger bonds.

**Hint:** Think about how the number of shared electrons affects the strength of the bond.

### Step 3: Relate Bond Order to Bond Energy
As bond order increases, the bond becomes stronger, which means that more energy is required to break it. Therefore, the bond energy increases with an increase in bond order.

**Hint:** Consider the relationship between bond strength and the energy required to break the bond.

### Step 4: Conclusion on Assertion and Reason
Since the assertion correctly states the order of bond energies and the reason accurately explains why bond energy increases with bond order, both statements are true.

**Hint:** Check if the reason logically supports the assertion.

### Final Answer
Both the assertion and the reason are correct, and the reason provides a valid explanation for the assertion. Therefore, the correct conclusion is that both the assertion and the reason are true, and the reason correctly explains the assertion.