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Question

BCl3 does not exist as a dimer but BH3 exists as a dimer because:

A
Chlorine is more electronegative than hydrogen
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B
There is a pπpπ back bonding in BCl3 but BH3 does not contain such bonds
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C
Large sized chlorine atoms do not fit in between the boron atoms whereas small sized hydrogen atoms fit in between the boron atoms
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D
None of the above
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Solution

The correct option is C Large sized chlorine atoms do not fit in between the boron atoms whereas small sized hydrogen atoms fit in between the boron atoms
BCl3 does not exist as dimer but BH3 exists as dimer (B2H6) because, large sized chlorine atoms do not fit in well between the small boron atoms. Whereas the smaller sized hydrogen atoms can well fit in between the boron atoms.

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