Example for electron deficient hydride is :

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${BeH}_{2}$

$B_{2} H_{6}$

${CaH}_{2}$

${CH}_{4}$

answer is C.

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Detailed Solution

BH₃is 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 sp3 hybridized. B₂H₆ 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.

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