Assertion: Be has complex formation tendency
Reason: Be is s-block element.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion
C. If Assertion is True but the Reason is False
D. If both Assertion & Reason are False

Answer

To analyze the given assertion and reason, let's break down the information step by step:

### Step 1: Understand the Assertion
- **Assertion**: Beryllium (Be) has a complex formation tendency.
- **Explanation**: Complex formation involves a central metal atom (in this case, Be) bonding with ligands that donate electron pairs to form coordinate bonds.

**Hint**: Recall the definition of complex formation and the role of ligands.

### Step 2: Analyze the Reason
- **Reason**: Beryllium is an s-block element.
- **Explanation**: The s-block elements are those in which the outermost electrons are in the s orbital. Beryllium is located in Group 2 of the periodic table, which is classified as the s-block.

**Hint**: Identify the characteristics of s-block elements and their electronic configurations.

### Step 3: Examine Beryllium's Electronic Configuration
- Beryllium has an atomic number of 4, with an electronic configuration of 1s² 2s².
- In order to form complexes, beryllium can promote one of its 2s electrons to the 2p orbital, allowing it to have empty orbitals available for bonding with ligands.

**Hint**: Think about how electron promotion affects bonding capabilities.

### Step 4: Determine the Truth of the Assertion and Reason
- The assertion is true because beryllium does have a tendency to form complexes due to its ability to utilize empty orbitals.
- The reason is also true because beryllium is indeed an s-block element. However, the reason does not explain why beryllium has a complex formation tendency.

**Hint**: Differentiate between a true statement and its relevance as an explanation.

### Step 5: Conclusion
- Since both the assertion and reason are true, but the reason does not correctly explain the assertion, the correct option is: **Both assertion and reason are true, but the reason is not a correct explanation of the assertion**.

**Final Answer**: Option 2.