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

(N/A) An electron-deficient hydride is a type of molecular hydride that has too few electrons to write its conventional Lewis structure.
Regarding structure,these hydrides often exhibit multi-center bonding (e.g.,$3$-center-$2$-electron bonds) to compensate for the lack of electrons,as seen in diborane $(B_{2}H_{6})$.
Regarding chemical reactions,because they have an incomplete octet or lack sufficient electrons to form standard covalent bonds,they act as $Lewis$ acids,meaning they are electron-pair acceptors.
They readily react with $Lewis$ bases to complete their octets or stabilize their structures.