Chemistry - CHEMICAL BONDING Question with Solution | TestHub

Question Explanation: Analyzing Molecular Orbital Theory and bonding in Beryllium compounds. Concept: Molecular Orbital Theory and Bonding

Solution:

1. A: Correct. In bridged dimers, the repulsion between the bridging atoms usually closes the bridge angle.

2. B: Correct. Be²⁺ is a very "hard" Lewis acid. I⁻ is a "soft" base. The interaction is weak.

3. C: Incorrect. According to MOT, Be₂ has a configuration ${\sigma }_{1s}^2{\sigma }_{1s}^{\ast 2}{\sigma }_{2s}^2{\sigma }_{2s}^{\ast 2}$. Bond order = $(4-4)/2=0$. Be₂ is not stable.

4. D: Correct. Smaller electronegativity difference and high polarization of I⁻ make BeI₂ covalent.

Final Answer: The bond order in Be₂ molecule is 1, explaining its existence in the gas phase at high temperatures.