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Question

Identify the correct statements regarding structure of diborane

A
All hydrogen atoms are not in same plane
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B
Each boron atom is in sp3 hybridized state
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C
There are two bridging hydrogen atoms.
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D
Each boron atom forms four bonds
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Solution

The correct option is D Each boron atom forms four bonds
a) BH3 dimerizes to give diborane (B2H6), in which two hydrogen atoms are bridged and four hydrogen atoms are terminal.
b) On dimerization, each boron atom is bonded with two terminal and two bridged hydrigen atoms i.e each has a steric number of 4. Hence both borons in B2H6 are sp3 hybridised.
c) In B2H6, two borons and four terminal hydrogens lie in same plane, while bridged hydrogen atoms lie above and below the plane.
d)The dimerized BH3 has four sigma bonds. Hence steric number of B is four. So each boron in diborane is sp3 hybridized.

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