BCl3 exists as monomer whereas AlCl3 dim...

`BCl_3` exists as monomer whereas `AlCl_3` dimerises through halogen bridging. This is because of the

small size of B atom as compare to Al

absence of d orbital in B atom

`p pi-p pi` back bonding in `AlCl_3`

`p pi-p pi` back bonding in `BCl_3`

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The correct Answer is:

Due to the absence of d-orbitals, `BCl_3` does not dimerise but in `AlCl_3`, Al contains empty d-orbital so it is capable to undergo dimerisation.

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