Electron deficient species among the following is:

B_{2} H_{6}

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H_{2} O

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{C H}_{4}

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S {C l}_{2}

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Solution

The correct option is B $B_{2} H_{6}$
Diborane- $(B_{2} H_{6})$ is said to be electron deficient because boron require 5 electrons to complete its octet. But in this molecule, each boron atom is bonded to 2 terminal hydrogen atoms each. Also, the two boron atoms are held together by two hydrogen atoms.Thus, its left with 1 valence electron.

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