Chemistry - Complete Pblock- Question with Solution | TestHub
Which of the following changes about B when is reacted with excess at room temperature.
(a) < BHB bond angle
(b) Total valence electrons around B.
(c) Lewis acidic Nature
(d) Hybridisation of B
Options:
Answer:
Solution:
When B₂H₆ reacts with excess NH₃ at room temperature, it forms an ionic compound, .
1. BHB bond angle: In B₂H₆, there are bridge hydrogens, leading to a BHB angle. In the product, these bridge bonds are broken, and B forms bonds with NH₃, changing the bond angles around B.
2. Total valence electrons around B: In B₂H₆, B is electron deficient (6 valence electrons). In , B forms four bonds, achieving 8 valence electrons. In , B also forms four bonds, achieving 8 valence electrons.
3. Lewis acidic Nature: B₂H₆ is a Lewis acid due to electron deficiency. The products, and , have satisfied octets around B and are less Lewis acidic.
4. Hybridisation of B: In B₂H₆, B is sp³ hybridized. In the product, both B atoms are also sp³ hybridized.
Therefore, (a), (b), and (c) change.
The final answer is