Published by:
CGP EDU Academic Team
Published on: August 13, 2026
does not exist as dimer but 
exist as dimer 
because
A
Chlorine is more electronegative than hydrogen
B
There is 
back bonding in 
but 
does not contain such bonding
back bonding in but does not contain such bonding C
Large sized chlorine atoms do not fit between the small boron atoms whereas small sized hydrogen atoms easily fit between boron atoms.
D
Boron forms a weak bond with hydrogen.
Text Solution
Verified by ExpertsThe correct answer is:
C
Chlorine is large in size than hydrogen. So, it does not fit in the spaces between the small
boron atoms and thus reduces its electron deficiency by back bonding.
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