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${BCl}_{3}$ does not exist as a dimer but BH₃, exists as $B_{2} H_{6}$ because:

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Both (2) and (3).

Large size of chlorine atom does not fit between small-sized boron atoms, while small-sized hydrogen atoms occupy the space between boron atoms.

There is $pπ - pπ$ back bonding in ${BCl}_{3} .$

Chlorine is more electronegative than hydrogen.

answer is B.

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Detailed Solution

Large sized chlorine atoms do not fit in between the small baron atoms whereas small sized hydrogen atoms get fitted in between boron atoms so BCl₃ does not exist as dimer but BH₃ exist as dimer (B₂H₆).

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