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Q.

BCl3 does not exist as dimer but BH3 exists as dimer (B2H6) because

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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

answer is C.

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Detailed Solution

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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BCl3 does not exist as dimer but BH3 exists as dimer (B2H6) because