Question

All the $Al-Cl$ bonds in $A{l}_{2}C{l}_6$ are equivalent.

• A. True
• B. False

Answer 1

The correct option is B False

${Al}_2{Cl}_6$ is dimerised form of $Al{Cl}_3$

$Al{Cl}_3$ has an incomplete octet on Al atom.

Dimerisation occurs in order to attain stability.

(Image)

In dimerised structure,

there are $23c-4e$ bonds and $42c-2e$ bonds.

$\therefore$ Not all bonds in ${Al}_2{Cl}_6$ are equivalent.

The given statement is false.

Hence, the statement: All the Al-Cl bonds in ${Al}_2{Cl}_6$ are equivalent is FALSE.

As you can see, the terminal Al-Cl bonds are shorter (206 pm) compared to longer bridged Al-Cl bonds (221 pm).