Question

Boron compounds behave as Lewis acids because of their :

• A. acidic nature
• B. covalet nature
• C. ionic nature
• D. vacant orbital

Answer 1

The correct option is D vacant orbital

In trivalent state of B ($B{F}_3$), the number of electrons around the central atom in a molecule will be only six. Such electron deficient molecules tend to accept a pair of electrons to achieve stable electronic configuration and behave as Lewis acids. Boron compounds behave as Lewis acids because of their vacant orbital.