Question

The total number of atoms lie in a same plane in diborane are :

• A. 4
• B. 6
• C. 8
• D. 2

Answer 1

The correct option is B 6

The four terminal hydrogen atoms and two boron atoms lie in one plane, above and below this plane are two bridging hydrogen atoms.

THEORY
Diborane $\left(B_2{H}_6\right)$:
Binary compounds of Boron with Hydrogen are called boron hydrides or boranes. The simplest boron hydride known is diborane.

The four-terminal hydrogen atoms and two boron atoms lie in one plane, above and below this plane are two bridging hydrogen atoms.
The four-terminal B-H bonds are regular two centre-two electron bonds while the two bridge (B-H-B) bonds are three centre-two electron bonds.