why BCl3 does not exist as dimer like AlCl3 ?why?
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Explanation:
Why is BCl3 a monomer whereas AlCl3 exists as a dimer? The bond length and atomic size of boron in BCl3 are smaller than in AlCl3 so this leads to interatomic repulsion so BCl3 could not accept another BCl3 via a dative bond because it leads to more repulsion and finally breaking of dimer.
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