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BCl(3) does not exist as dimer but BH(3)...

`BCl_(3)` does not exist as dimer but `BH_(3)` exist as dimer `(B_(2)H_(6))` because :-

A

Cl is more electropositive than H

B

There is `p pi - p pi` back bond in `BCl_(3)` but `BH_(3)` does not contain such multiple bonding.

C

Large sized chlorine atoms do not fit in between small sized boron atoms where as small sized hydrogen atoms get fitted in between boron atoms

D

None of these

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