Question

Which of the following is not hypovalent but complete its octet?

• A. $AlC{l}_3$
• B. $AlB{r}_3$
• C. $Al{F}_3$
• D. $B{F}_3$

Answer 1

The correct option is C $Al{F}_3$

Hypovalent species are those which have less than eight electrons in its valence shell. Fluorine has very high electronegativity so, $Al{F}_3$ is ionic in nature. And $A{l}^{3+}$ ion has 8 electron in valence shell (2s &2p). So $Al{F}_3$ is not hypovalent. $AlC{l}_3$ , $AlB{r}_3$ and $B{F}_3$ are all hypovalent or electron deficient species and act as a lewis acid.