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  4. Which of the following is the electron deficient molecule?

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Q. Which of the following is the electron deficient molecule?

AIPMTAIPMT 2005

Solution:

$B_2H_6$ is electron deficient molecule because
boron atom has three half-filled orbitals in excited
state. The structure of $B_2H_6$ is represented as follows:
In it two electrons of a $B - H$ bond are involved in
formation of three centre bond, these bonds are
represented as dotted lines.

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