BCl3 does not exist as a dimer but BH3, exists as B2H6 because:
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a
Chlorine is more electronegative than hydrogen.
b
Large size of chlorine atom does not fit between small-sized boron atoms, while small-sized hydrogen atoms occupy the space between boron atoms.
c
There is pπ−pπ back bonding in BCl3.
d
Both (2) and (3).
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).