Why is BF_3 weaker Lewis acid than BCI_3 ? - Vidyadip

Question

Why is $\mathrm{BF}_3$ weaker Lewis acid than $\mathrm{BCI}_3$ ?

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Answer

$\mathrm{BF}_3$ is weaker Lewis acid than $\mathrm{BCl}_3$ because of more effective back bonding in case of F due to smaller size than Cl.

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