Which feature of borane's structure contributes most significantly to its electron deficiency?

Why are boranes classified as Lewis acids?

What is the product formed when borane (BH3) reacts with ammonia (NH3), and what type of bond is formed?

When diborane reacts with water, what is the main type of reaction observed, and what are the products?

How does the three-center two-electron bond in diborane influence its chemical behavior?