MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic Chemistryp-Block (group 13 and 14)Previous Year Questions

Aluminium (III) chloride forms a dimer because Aluminium (AIPMT 1995)

A.belongs to 3rd group

B.can have higher coordination number✓ Correct

C.cannot form a trimer

D.has high ionization energy.

Explanation

AlCl₃ forms a dimer, as Al due to the presence of 3d-orbitals can expand its covalency from four to six. Also dimerisation enables Al atoms to complete their octets.

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