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AP EAMCET202124 Aug 2021Evening ShiftChemistryChemical Bonding and Molecular StructureActual

Aluminium (III) chloride forms a dimer because aluminium

Options

  1. Abelongs to boron family.
  2. Bhas a very high ionisation enthalpy.
  3. Ccan have higher coordination number.
  4. Dis next to magnesium.

Correct answer

C. can have higher coordination number.

Step-by-step solution

AlCl ₃ can form dimer and exists as Al ₂ Cl ₆ because aluminium has vacant d -orbital which can accomodate electron from chlorine atom. AlCl ₃ is an electron deficient compound that completes its octet by taking electron pair from Cl atom. So, Al can have higher coordination number.

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