# What characteristics do you expect from an electron-deficient hydride with respect to its sturuture and chemical reactions?

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

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An electron deficient hydride does not have sufficient electrons to form a regular bond in which two electons are shared by atoms e.g. B_(2)H_(6),Al_(2)H_(6) etc. These hydrides cannot be represented by conventional Lewis structures. B_(2)H_(6) for example, contains four regular bonds and two three centered two electron bond. Its structures can be represented as:

Since these hydrides are electrons defiocient, they have a tendency to accept electrons. Hence, they are as Lewis acids.
B_(2)H_(6)+2NMe to 2BH_(3).NMe,
B_(2)H_(6)+2CO to 2BH_(3).CO

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