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Q.

BCl3 does not exist  as dimer but BH3 exist 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 get fitted in between boron atoms

d

None of the above

answer is C.

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Detailed Solution

BCl3 does not dimerizes because large size chlorine atom does not overlap effectively with small size boron atom
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BCl3 does not exist  as dimer but BH3 exist as dimer B2H6 because