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Q.
Which of the following is electron deficient molecule?
The p-Block Elements
Solution:
In $B _{2} H _{6}$, each $B$ - atom uses $sp ^{3}$ - hybrid orbitals for bonding out of $4 sp ^{3}$ - hybrid orbitals, one orbital is empty. Here, one half filled orbital of other $B$ - atoms overlaps with one empty orbital of other $B$ - atom and half - filled orbitals of hydrogen atom resulting in $3$ centered two $e- $ bridge bonds. Thus, these bonds are electron deficient.
