Assertion : The carbon-carbon bond length in benzene lies between the bond lengths of C-C and C=C bonds found in other molecules.
Reason: Benzene exhibits the phenomenon of resonance

Options

A. If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.
B. If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.
C. I Assertion is CORRECT but Reason is INCORRECT.
D. If Assertion is INCORRECT but Reason is CORRECT.

Answer

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

### Step 1: Understand the Assertion
The assertion states that the carbon-carbon bond length in benzene lies between the bond lengths of carbon-carbon single bonds and carbon-carbon double bonds found in other molecules.

- **Bond Lengths**:
- The bond length of a carbon-carbon single bond (C-C) is approximately 1.54 Å.
- The bond length of a carbon-carbon double bond (C=C) is approximately 1.34 Å.
- The bond length in benzene (C6H6) is measured to be around 1.40 Å.

### Step 2: Analyze the Bond Length in Benzene
From the bond lengths mentioned:
- The bond length of benzene (1.40 Å) is indeed between the bond lengths of C-C (1.54 Å) and C=C (1.34 Å).

Thus, the assertion is **correct**.

### Step 3: Understand the Reason
The reason provided states that benzene exhibits the phenomenon of resonance.

- **Resonance in Benzene**:
- Benzene can be represented by multiple resonance structures (canonical forms), which show the delocalization of electrons across the carbon atoms.
- This delocalization means that the bonds in benzene are not purely single or double but have characteristics of both.

### Step 4: Connect the Reason to the Assertion
Due to resonance:
- The carbon-carbon bonds in benzene have a partial double bond character and a partial single bond character.
- This results in bond lengths that are intermediate between a single bond and a double bond.

Thus, the reason is also **correct** and provides a valid explanation for the assertion.

### Conclusion
Both the assertion and the reason are correct, and the reason correctly explains the assertion.

### Final Answer
The correct option is: **A** (Both assertion and reason are correct, and the reason is the correct explanation of the assertion).

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