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p-Block Elements - I
medium
$BCl_3$, exists as monomer whereas $AlCl_3$ is dimerized through halogen bridging. Give reason. Explain the structure of the dimer of $AlCl_3$ also.
Option A
Option B
Option C
Option D
Solution
$\mathrm{BCl}_{3}$ does not dimerize because of its small size. $\mathrm{BCl}_{3}$ do not exist as a dimer. Boron cannot accommodate four large sized chloride ions. $\mathrm{AlCl}_{3}$ exist as a dimer in which $\mathrm{Al}$ uses its vacant $3 p$-orbital by coordinate with $\mathrm{Cl}$ to complete their octet by forming dimer. $\mathrm{AlCl}_{3}$ achieves stability by forming a dimer.
Standard 11
Chemistry
