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Question:

Which of the following is electron-deficient?

PH3

(CH3)2

(SiH3)2

(BH3)2

Solution:

Diborane ((BH3)2) is an electron-deficient species. It contains fewer electrons than required for bonding. In diborane, 14 electrons are required to form 7 bonds; however, only 12 electrons are present.