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

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Solution

Electron deficient compounds of hydrogen do not have sufficient number of electrons to form normal covalent bonds. Examples include hydrides of group 13 such as $B H_{3}, A l H_{3}$ etc.
They exist in polymeric forms such as $B_{2} H_{6}, A l_{2} H_{6}$ . Thus, they make up their deficiency.
These compounds are electron acceptors (Lewis acids). They form complexes with Lewis bases.
$B_{2} H_{6} + 2 N M e_{3} \to 2 B H_{3} \leftarrow N M e_{3}$
$B_{2} H_{6} + 2 C O \to 2 B H_{3} \leftarrow C O$

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