Which of the following molecule has complete octet as well as non-polar

Options

A. `(a)B_(2)H_(6)`
B. (b)`Al_(2)Cl_(6)`
C. (c)`Be_(2)H_(4)`
D. (d)`I_(2)Cl_(6)`

Answer

To determine which molecule has a complete octet and is non-polar, we will analyze each option provided in the question step by step.

### Step 1: Understanding Complete Octet
A complete octet refers to an atom having eight electrons in its valence shell, which is a stable configuration. For hydrogen and helium, a complete octet is achieved with two electrons.

### Step 2: Understanding Non-Polar Molecules
Non-polar molecules have a net dipole moment of zero. This typically occurs when the molecule has symmetrical charge distribution, meaning that the electronegativity difference between the atoms is negligible, or the molecular geometry cancels out any dipole moments.

### Step 3: Analyzing Each Option

1. **Option A: B2H6 (Diborane)**
- Structure: Diborane has two boron atoms and six hydrogen atoms.
- Octet: Each boron atom shares electrons with hydrogen atoms, achieving a total of 8 electrons around each boron.
- Polarity: The geometry of B2H6 is symmetrical, leading to a net dipole moment of zero.
- Conclusion: B2H6 has a complete octet and is non-polar.

2. **Option B: Al2Cl6 (Aluminium Chloride)**
- Structure: This molecule consists of aluminium and chlorine atoms.
- Octet: Due to steric hindrance and the large size of the atoms, aluminium cannot achieve a complete octet.
- Conclusion: Al2Cl6 does not have a complete octet.

3. **Option C: Be2H4 (Beryllium Hydride)**
- Structure: This molecule consists of beryllium and hydrogen atoms.
- Octet: Beryllium typically has only 4 electrons in its valence shell, thus it does not achieve a complete octet.
- Conclusion: Be2H4 does not have a complete octet.

4. **Option D: I2Cl6 (Iodine Hexachloride)**
- Structure: This molecule consists of iodine and chlorine atoms.
- Octet: Similar to Al2Cl6, the large size of the atoms leads to steric hindrance, preventing a complete octet.
- Conclusion: I2Cl6 does not have a complete octet.

### Final Conclusion
After analyzing all the options, the only molecule that has a complete octet and is non-polar is **B2H6**.

### Answer: B2H6

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