Which one of following is not an electron deficient compound

Options

A. `BCI_(3)`
B. `AICI_(3)`
C. `B_(2)H_(6)`
D. `Al_(2)CI_(6)`

Answer

To determine which of the given compounds is not an electron deficient compound, we need to analyze the electron configuration of each compound in terms of their octet.

### Step-by-Step Solution:

1. **Understanding Electron Deficiency**:
- Electron deficient compounds are those that do not have a complete octet of electrons in their valence shell. This means they have fewer than 8 electrons around the central atom.

2. **Analyzing BCl3**:
- BCl3 (Boron trichloride) has boron as the central atom. Boron has 3 valence electrons and forms three bonds with chlorine atoms.
- Total electrons around boron = 3 (from boron) + 3 (one from each Cl) = 6 electrons.
- Since boron has only 6 electrons, BCl3 is an electron deficient compound.

3. **Analyzing AlCl3**:
- AlCl3 (Aluminum chloride) has aluminum as the central atom. Aluminum has 3 valence electrons and forms three bonds with chlorine atoms.
- Total electrons around aluminum = 3 (from aluminum) + 3 (one from each Cl) = 6 electrons.
- Thus, AlCl3 is also an electron deficient compound.

4. **Analyzing B2H6**:
- B2H6 (Diborane) consists of two boron atoms and six hydrogen atoms. Each boron atom shares its electrons with hydrogen.
- Each boron atom effectively has 6 electrons (3 from bonds with H) and does not complete its octet.
- Therefore, B2H6 is also an electron deficient compound.

5. **Analyzing Al2Cl6**:
- Al2Cl6 (Dimer of Aluminum chloride) consists of two aluminum atoms and six chlorine atoms. In this compound, the two AlCl3 units combine to form a dimer.
- In this structure, each aluminum atom can share electrons with the chlorine atoms through coordinate bonds, allowing them to achieve a complete octet.
- Therefore, Al2Cl6 is not an electron deficient compound because it can achieve an octet through bonding.

### Conclusion:
The compound that is **not** electron deficient is **Al2Cl6**.

### Final Answer:
**Al2Cl6** is not an electron deficient compound.

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