Question

Which one of the following is not an electron deficient compound?

• A. $BC{l}_3$
• B. $AlC{l}_3$
• C. $A{l}_{2}C{l}_6$
• D. $B_2{H}_6$

Answer 1

Answer: (C)

$A{l}_{2}C{l}_6$

Electron deficient compounds are those for which the octet is incomplete.In $BC{l}_3$, Boron has only 6 electrons in outermost shell. Similarly, in $AlC{l}_3$, Al has only 6 electrons in the outermost shell. $A{l}_{2}C{l}_6$ is not an electron deficient compound since it has a coordinate bond among Al and Cl atoms between one $AlC{l}_3$ molecule and the other, In $B_2{H}_6$also, boron has only 6 electrons in the outermost shell.