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CGP EDU Academic Team
Published on: August 11, 2026
AlCl 3 forms dimer in vapour phase but BCls does not because
Text Solution
Verified by ExpertsThe correct answer is:
A
The formation of stronger back bond (3p 
2p overlap in BCls and weaker 3p 
3p overlap in AlCl 3 ) reduces the electron deficiency of the central atom and thus dimerization tendency is reduced. So AlCl 3 can form a dimer but BF 3 and BCl 3 cannot.
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