Question

Number of coordinate bonds, which are formed, when $AlC{l}_3$ dimerises is/are:

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer 1

Answer: (B)

$2$

During dimerization of $AlC{l}_3$, two coordinate bonds are formed. In $A{l}_{2}C{l}_6$ molecule, there are $4$ terminal $Cl$ atoms and $2$ bridged $Cl$ atoms. These bridged $Cl$ atoms donate their lone pair of electron to $2Al$ atoms to form $2$ coordinate bonds.