Answer:
Electron deficient hydrides generally
exist in polymeric forms. Their molecules have hydrogen bridges, i.e., three
centre two electrons bonds.
Electron deficient
hydrides act as Lewis acids and combine with Lewis bases. For example,
\[{{B}_{2}}{{H}_{6}}+2CO\to 2{{H}_{3}}B\leftarrow CO\]
\[{{B}_{2}}{{H}_{6}}+2N{{H}_{3}}\to 2{{H}_{3}}B\leftarrow N{{H}_{3}}\]
Electron
deficient hydrides are reactive in nature as to make up the deficiency of
electrons, they can react with metals, non-metals and their compounds.
\[NaH+Al{{H}_{3}}\to NaAl{{H}_{4}}\]
\[2LiH+{{B}_{2}}{{H}_{6}}\to
2LiB{{H}_{4}}\]
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