Which of the following is electron-deficient?

Options

(a) (SiH₃)₂
(b) (BH₃)₂
(c) PH₃
(d) (CH₃)₂

Correct Answer:

(BH₃)₂

Explanation:

Electron deficient molecules are compounds which do not have sufficient number of eletrons to form normal covalent bonds. (BH₃)₂ has two 3 centre – 2 electron bonds.