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BCl3 does not exist as dimer but BH3 exists 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 fit between boron atoms
d
None of these
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detailed solution

Correct option is C

Large-sized chlorine atoms do not fit in between the small boron atoms, whereas small-sized hydrogen atoms fit between boron atoms


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