# 9.9  What characteristics do you expect from an electron-deficient hydride with respect to its structure and chemical reactions

Electron-deficient hydrides do not have required electrons to form a regular bond in which two electrons are shared by two atoms. e.g. $B_{2}H_{6},Al_{2}H_{6}$ etc
$\\B_{2}H_{6}+2NMe\rightarrow 2BH_{3}.NMe_{3}\\B_{2}H_{6}+2CO\rightarrow 2BH_{3}.CO$