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p-Block Elements - I
medium
Which of the following is an electron deficient molecule?
A
$LiH$
B
$B_2H_6$
C
$LiBH_4$
D
$B_3N_3H_6$
Solution
$\mathrm{B}_{2} \mathrm{H}_{6}$ is electron deficient molecule because boron atom has three half-filled orbitals in an excited state.
The structure of $\mathrm{B}_{2} \mathrm{H}_{6}$ is represented as follows:
In it, two electrons of $\mathrm{B}$ -H bond are involved in the formation of three centre bond, these bonds are represented by a dotted line.
Hence, option A is correct.
Standard 11
Chemistry
