Which of the following hydrides is electron deficient?

N a H

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C a H_{2}

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C H_{4}

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B_{2} H_{6}

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Solution

The correct option is D $B_{2} H_{6}$
$(B H_{3})$ is the chemical formula for the Boron atom. It is surrounded by 6 electrons, so it is electron deficient due to its incomplete octet. B-atom in diborane is $s p^{3}$ hybridized. $B_{2} H_{6}$ molecule has a total of 8 covalent bonds but only 12 electrons i.e. 6 pairs. So, it has two electron pairs less than the maximum required number for bonding, which makes it electron deficient.

The answer is option D.

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