In the structure of Diborane
(A) aAll hydrogen atoms lie in one plane and boron atoms lie in a plane perpendicular to this plane.
(B) 2 Boron atoms and 4 terminal hydrogen atoms lie in the same plane and 2 bridging hydrogen atoms lie in the perpendicular plane.
(C) 4 Bridging hydrogen atoms and boron atoms lie in one plane and two terminal hydrogen atoms lie in a plane perpendicular to this plane.
(D) All the atoms are in the same plane.
In the structure of Diborane
(A) aAll hydrogen atoms lie in one plane and boron atoms lie in a plane perpendicular to this plane.
(B) 2 Boron atoms and 4 terminal hydrogen atoms lie in the same plane and 2 bridging hydrogen atoms lie in the perpendicular plane.
(C) 4 Bridging hydrogen atoms and boron atoms lie in one plane and two terminal hydrogen atoms lie in a plane perpendicular to this plane.
(D) All the atoms are in the same plane.
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1 Answer
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This is a Multiple Choice Questions as classified in NCERT Exemplar
B
The four terminal hydrogen atoms and two boron atoms are all in the same plane.
There are two bridging hydrogen atoms above and below this plane.
The four terminal B-H bonds are regular two-centre-two-electron bonds, whereas the two bridge (B-H-B) bonds are unique and can be described as three-centre-two-electron bonds, as shown in figure:

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