A : Carbon has maximum tendency of catenation among group 14 .
R : C- C bond strength is very strong .

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion , then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion , then mark (2)
C. If Assertion is true statement but Reason is false , then mark (3)
D. If both Assertion and Reason are false statements , then mark (4)

Answer

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

**Assertion (A)**: Carbon has maximum tendency of catenation among group 14.
**Reason (R)**: C-C bond strength is very strong.

### Step-by-Step Solution:

1. **Understanding Catenation**:
- Catenation is the ability of an element to form long chains by bonding with itself.
- It is a significant property of carbon, which allows it to form various organic compounds.

**Hint**: Remember that catenation is about elements bonding with themselves to form chains.

2. **Group 14 Elements**:
- The elements in Group 14 are Carbon (C), Silicon (Si), Germanium (Ge), Tin (Sn), and Lead (Pb).
- All these elements exhibit tetravalency, meaning they can form four bonds.

**Hint**: Identify the elements in Group 14 and their common property of tetravalency.

3. **Size and Bond Strength**:
- The size of the atoms increases as we move down the group. Carbon is the smallest in size among these elements.
- Smaller size leads to stronger bonds due to better overlap of orbitals. Therefore, the C-C bond is stronger than Si-Si, Ge-Ge, Sn-Sn, and Pb-Pb bonds.

**Hint**: Consider how atomic size affects bond strength; smaller atoms typically form stronger bonds.

4. **Comparison of Bond Strength**:
- C-C bond strength is higher than that of Si-Si, which in turn is stronger than Ge-Ge, and so on down the group.
- This increased bond strength in carbon allows it to catenate more effectively, forming long chains and complex structures.

**Hint**: Recall that stronger bonds contribute to the ability to form stable chains.

5. **Conclusion**:
- Both the assertion and the reason are true.
- The reason (strong C-C bond strength) correctly explains the assertion (maximum catenation tendency of carbon).

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