Explain why the following compounds behave as Lewis acids?
$(A)$ $BCl_3$
$(B)$ $AlCl_3$
$(A)$ $BCl_3$
$(B)$ $AlCl_3$
(N/A) $BCl_3$ and $AlCl_3$ are electron-deficient compounds because the central metal atom has an incomplete octet. Therefore,they act as Lewis acids by accepting a lone pair of electrons.
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