BCl3 does not exist as dimer but BH3 exist as dimer B2H6 because

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Chlorine is more electronegative than hydrogen

There is pπ-pπ back bonding in BCl3 but BH3 does not contain such multiple bonding

Large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted in between boron atoms

None of the above

answer is C.

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Detailed Solution

BCl3 does not dimerizes because large size chlorine atom does not overlap effectively with small size boron atom

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