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-p-Block elements - I — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry-p-Block elements - I1 Mark
MCQ
Aluminium $(III)$ chloride forms a dimer because
  • ✓
    Higher coordination number can be achieved by aluminium
  • B
    Aluminium has high ionization energy
  • C
    Aluminium belongs to $III$ group
  • D
    It cannot form a trimer
✓

Answer

Correct option: A.
Higher coordination number can be achieved by aluminium
a
$AlCl _3$ can form dimer and exists as $Al _2 Cl _6$, aluminium has vacant $d$-orbitals which can accommodate electron from chlorine atom. $AlCl _3$ is an electron deficient compound in $Al$ (octet incomplete) thus behaves as Lewis acid and $Al$ completes it by taking electron pair from $Cl$-atom as shown in figure.

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