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Aluminium chloride in acidified aqueous solution forms a complex ‘A’, in which hybridisation state of Al is ‘B’. What are ‘A’ and ‘B’, respectively?

1. (a) [Al(H2O)6]3+, dsp3
2. (b) [Al(H2O)6]3+, sp3d2
3. (c) [Al(H2O)4]3+, sp3
4. (d) [Al(H2O)4]3+, dsp2

Correct answer: (b) [Al(H2O)6]3+, sp3d2

Solution

In acidified aqueous solution, AlCl3 forms the hexaaqua complex [Al(H2O)6]3+. The central Al atom undergoes sp3d2 hybridization to accommodate six ligands in an octahedral geometry.

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