A : Heavier elements of 14th group do not form `p pi - p pi` bonds .
R : Atomic orbital of heavier elements are too large and do not have effective overlapping .

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 assertion-reason question, we need to analyze both the assertion (A) and the reason (R) provided.

### Step-by-Step Solution:

1. **Understanding the Assertion (A):**
- The assertion states that "heavier elements of the 14th group do not form `p pi - p pi` bonds."
- The 14th group elements include Carbon (C), Silicon (Si), Germanium (Ge), Tin (Sn), and Lead (Pb).
- As we move down the group from Carbon to Lead, the atomic size increases due to the addition of electron shells.

2. **Understanding the Reason (R):**
- The reason states that "atomic orbitals of heavier elements are too large and do not have effective overlapping."
- Larger atomic orbitals mean that the distance between the nuclei of the atoms increases, which leads to less effective orbital overlap.

3. **Analyzing the Relationship:**
- The assertion is based on the observation that heavier elements (like Pb) do not form `p pi - p pi` bonds due to their larger size.
- The reason provides a valid explanation for this observation by stating that the larger atomic orbitals lead to ineffective overlapping.

4. **Conclusion:**
- Both the assertion and the reason are correct.
- The reason correctly explains why the assertion is true.

### Final Answer:
- Both Assertion (A) and Reason (R) are correct, and the reason is the correct explanation of the assertion.

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