Question

Co-ordination number of $Al$ in the crystalline state of $AlC{l}_3$ is

• A. Four
• B. three
• C. five
• D. six

Answer 1

The correct option is D six

AlCl3AlCl3 in acidified aqueous solution crystallises as octahedral [Al(H2O)6]+3Cl−33[Al(H2O)6]+3Cl3-3. In this complex, the 3d3d orbitals of AlAl are involved and hybridisation state of AlAl is sp2d2sp2d2. Hence, the coordination number of AlAl is six. It exits in lattice with six coordinate layer structure.