Which of the following statements is correct?

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(B) Both $BCl_3$ and $AlCl_3$ are electron-deficient compounds and act as Lewis acids.In $BCl_3$,the boron atom undergoes $p\pi-p\pi$ back-bonding wit

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

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(B) Both $BCl_3$ and $AlCl_3$ are electron-deficient compounds and act as Lewis acids.In $BCl_3$,the boron atom undergoes $p\pi-p\pi$ back-bonding with chlorine atoms,which reduces its electron deficiency.In $AlCl_3$,the aluminum atom is larger and does not undergo effective $p\pi-p\pi$ back-bonding.Therefore,$AlCl_3$ is more electron-deficient and acts as a stronger Lewis acid than $BCl_3$.

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