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.
BETA
