A: `AI_(2)(CH_(3))_(6)` is a dimeric compound and has Similar structure to diborane. R: `AI_(2)(CH_(3))_(6)` in a sigma bonded complex

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 regarding the assertion and reason about the compound \( \text{Al}_2(\text{CH}_3)_6 \), we will analyze both statements step by step.

### Step 1: Analyze the Assertion
The assertion states that \( \text{Al}_2(\text{CH}_3)_6 \) is a dimeric compound and has a similar structure to diborane.

- **Dimeric Nature**: \( \text{Al}_2(\text{CH}_3)_6 \) is indeed a dimer of trimethyl aluminum \( (\text{Al(CH}_3)_3) \). This means that two trimethyl aluminum units combine to form the dimeric structure.

- **Structural Similarity to Diborane**: Diborane \( (\text{B}_2\text{H}_6) \) has a structure characterized by three-center two-electron bonds. In \( \text{Al}_2(\text{CH}_3)_6 \), similar bonding occurs where aluminum atoms and carbon atoms from the methyl groups form three-center two-electron bonds, resembling the bonding in diborane.

**Conclusion**: The assertion is true.

### Step 2: Analyze the Reason
The reason states that \( \text{Al}_2(\text{CH}_3)_6 \) is a sigma bonded complex.

- **Sigma Bonding**: In \( \text{Al}_2(\text{CH}_3)_6 \), all the bonds formed are single bonds (sigma bonds). There are no pi bonds present. The bonding involves end-to-end overlap of atomic orbitals, which is characteristic of sigma bonds.

**Conclusion**: The reason is also true.

### Step 3: Determine the Relationship Between Assertion and Reason
While both the assertion and reason are true, we need to determine if the reason correctly explains the assertion.

- The assertion describes the structure and dimeric nature of \( \text{Al}_2(\text{CH}_3)_6 \) and its similarity to diborane.
- The reason explains that it is a sigma bonded complex, which is a characteristic of the bonding but does not specifically explain why it is similar to diborane.

**Conclusion**: The reason does not provide a correct explanation for the assertion.

### Final Answer
Based on the analysis:
- Both the assertion and reason are true.
- The reason does not explain the assertion.

Thus, the correct option is **Option 2**: Both assertion and reason are true, but the reason is not the correct explanation of the assertion.

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