MCQ
Aluminium $(III)$ chloride forms a dimer because
- ✓Higher coordination number can be achieved by aluminium
- BAluminium has high ionization energy
- CAluminium belongs to $III$ group
- DIt 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.
$AlCl _3$ 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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