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Explain structures of diborane and boric acid.

11.19.    Explain structures of diborane and boric acid.

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Diborane-
diborane
The four terminal H atom and Boron lie in the same plane but two bridge H atom is below the plane. The four terminal B-H bonds are regular two centre-two electron bonds. The two   (B-H-B) bonds are known as banana bonds(3-centre-2-electron bonds).

Boric acid-
boric acid
It is a weak monobasic acid. It is Lewis acid, not protic acid. It has a layered structure, the BO_{3} molecule is linked by hydrogen-bonding with another BO_{3} molecule. The dotted line represents H-bonding.

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