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AP EAMCET · Chemistry · Chemical Bonding and Molecular Structure

Aluminium (III) chloride forms a dimer because aluminium

  1. A belongs to boron family.
  2. B has a very high ionisation enthalpy.
  3. C can have higher coordination number.
  4. D is next to magnesium.
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Answer & Solution

Correct Answer

(C) can have higher coordination number.

Step-by-step Solution

Detailed explanation

\(\mathrm{AlCl}_3\) can form dimer and exists as \(\mathrm{Al}_2 \mathrm{Cl}_6\) because aluminium has vacant \(d\)-orbital which can accomodate electron from chlorine atom. \(\mathrm{AlCl}_3\) is an electron deficient compound that completes its octet by taking electron pair…