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Which of the following is electron-deficient?

1. (a) (SiH3)2
2. (b) (BH3)2
3. (c) PH3
4. (d) (CH3)2

Correct answer: (b) (BH3)2

Solution

Electron-deficient compounds are those that do not have enough electrons to complete the octet of their central atom. (BH3)2 is electron-deficient because boron has only 6 valence electrons in its bonding structure.

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