BCl_3 does not exist as dimer but BH_3 exist as dimer because

1.	BCl_3 does not exist as dimer but BH_3 exist as dimer because
Answer» Cl is more electropossitive than H There is `P pi- P pi` back BONDING in `BCI_3` but `BH_3` does not CONTAIN such multiple bonding Large CHLORINE atoms do not FIT between small sized boron atoms whereas small hydrogen atoms get FITTED between boron atoms None of these Answer :B

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