Which one of the following is not an electron deficient compound

Electron deficient compounds are those for which the octet is incomplete. In BCl3​, Boron has only 6 electrons in outermost shell. Similarly, in AlCl3​, Al has only 6 electrons in the outermost shell. Al2​Cl6​ is not an electron deficient compound since it has a coordinate bond among Al and Cl atoms between one AlCl3​ molecule and the other, In B2​H6​also, boron has only 6 electrons in the outermost shell.