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what characteristics do you expect from an electro...

Question:
What characteristics do you expect from an electron-deficient hydride with respect to its structure and chemical reactions?

Answer:

An electron-deficient hydride does not have sufficient electrons to form a regular bond in which two electrons are shared by two atoms e.g., B₂H₆, Al₂H₆ etc.

These hydrides cannot be represented by conventional Lewis structures. B₂H₆, for example, contains four regular bonds and two three centered-two electron bond. Its structure can be represented as:

Since these hydrides are electron-deficient, they have a tendency to accept electrons. Hence, they act as Lewis acids.

B₂H₆ + 2NMe → 2BH₃ . NMe₃

B₂H₆ + 2CO → 2BH₃ . CO

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Question:
What characteristics do you expect from an electron-deficient hydride with respect to its structure and chemical reactions?