Question

In $A{l}_{2}C{l}_6$, which statement is incorrect-

• A. Four Al - Cl bonds are of same length and two of different length
• B. Six Al - Cl bonds are of same length and two of different length
• C. The angle Cl - Al - Cl is ${110}^0$ and ${93}^0$
• D. The angle Al - Cl - Al is ${87}^0$

Answer 1

All the Al-Cl bonds in $A{l}_{2}C{l}_6$ are not equivalent. The terminal Al−Cl bonds are different from bridge Al−Cl bonds. Six Al−Cl bonds are of the same length and two are of different lengths.
The angle Cl-Al-Cl is ${110}^0$ and ${93}^0$
The angle Al-Cl-Al is ${87}^0$

$A{l}_{2}C{l}_6$ has the structure given below-

Hence, The correct option is D.
Four Al - Cl bonds are of the same length and two of different lengths.