Which of the following statements is correct?

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(B) $BCl_3$ and $AlCl_3$ are both electron-deficient compounds and act as Lewis acids.In $BCl_3$,the boron atom undergoes back-bonding ($ppi-ppi$ back

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$BCl_3$ and $AlCl_3$ are both Lewis acids,and $AlCl_3$ is stronger than $BCl_3$.

Vedclass · Answer

(B) $BCl_3$ and $AlCl_3$ are both electron-deficient compounds and act as Lewis acids.In $BCl_3$,the boron atom undergoes back-bonding ($ppi-ppi$ back-bonding) from the chlorine lone pairs to the empty $2p$ orbital of boron,which reduces its electron deficiency.In $AlCl_3$,the $3p$ orbital of aluminum is larger,making the $ppi-ppi$ back-bonding with chlorine less effective compared to boron.Therefore,$AlCl_3$ is more electron-deficient and acts as a stronger Lewis acid than $BCl_3$.

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