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In the structure of $\mathrm{B}_2 \mathrm{H}_6$, the number of $\mathrm{BH}_2$ groups present in one plane, and the number of $\mathrm{B}-\mathrm{H}$ bonds, $\mathrm{B}-\mathrm{B}$ bonds, $\mathrm{B}-\mathrm{H}-\mathrm{B}$ bridge bonds are respectively
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2, 4, 0, 2
Diborane has three-centre two-electron bonds.
Number of $\mathrm{B}-\mathrm{H}$ bonds $=4$
Number of $\mathrm{B}-\mathrm{B}$ bonds $=0$
Number of $\mathrm{B}-\mathrm{H}-\mathrm{B}$ bridge bonds $=2$
Number of $\mathrm{BH}_2$ groups present in one plane $=2$
Number of $\mathrm{B}-\mathrm{H}$ bonds $=4$
Number of $\mathrm{B}-\mathrm{B}$ bonds $=0$
Number of $\mathrm{B}-\mathrm{H}-\mathrm{B}$ bridge bonds $=2$
Number of $\mathrm{BH}_2$ groups present in one plane $=2$
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