p-Block Elements-I 1 Question 4

4. The number of 2-centre-2-electron and 3-centre-2-electron bonds in B2H6, 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 B2H6 can be shown as :

alt text

In B2H6, four 2-centre-2-electron (2c2e) bonds are present in the same plane and two 3 -centre-2-electron (3c2e) bonds are present in another plane.



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