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Explain the following with suitable exam...

Explain the following with suitable examples :
Electron deficient hydrides

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Electron deficient hydrides: These are formed by elements of 13 group (Boron family). In these hydrides the electrons available ar not sufficient for making the bonds. They do not have octet around the central atom. So they act as Lewis acids.
Eg: Diborane `B_(2)H_(6)`
For writing the Lewis structure the number of available electrons are 12 but requi red are 14.
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