p-Block Elements-I 1 Question 4
4. The number of 2-centre-2-electron and 3-centre-2-electron bonds in $\mathrm{B} _{2} \mathrm{H} _{6}$, respectively, are
(2019 Main, 10 Jan II)
(a) 4 and 2
(b) 2 and 4
(c) 2 and 2
(d) 2 and 1
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Answer:
Correct Answer: 4. (a)
Solution:
- The structure of $\mathrm{B} _{2} \mathrm{H} _{6}$ can be shown as :
In $\mathrm{B} _{2} \mathrm{H} _{6}$, four 2-centre-2-electron $(2 c-2 e)$ bonds are present in the same plane and two 3 -centre-2-electron $(3 c-2 e)$ bonds are present in another plane.
