BCl3 does not exist as dimer but BH3 exist as dimer (B2H6) because:

there is p π - p π back bonding in BCl 3 but BH 3 does not contain such multiple bonding

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BCl₃ does not exist as dimer but BH₃exist as dimer (B₂H₆) because:

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

none of the above

there is p $π$ - p $π$ back bonding in BCl₃ but BH₃ does not contain such multiple bonding

chlorine is more electronegative than hydrogen

answer is B.

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There is P $π$ -P $π$ back bonding in BCl₃ but BH₃does not containing such multiple bonding

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