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

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By Expert Faculty of Sri Chaitanya
a
Chlorine is more electronegative than hydrogen
b
There is pπ-pπ back bonding in BCl3 but BH3 does not contain such multiple bonding
c
Large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted in between boron atoms
d
None of the above

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detailed solution

Correct option is C

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


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