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:

  1. The structure of $\mathrm{B} _{2} \mathrm{H} _{6}$ can be shown as :

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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.



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