Which of the following is the least basic?

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(D) The basicity of boron trihalides $(BX_3)$ depends on the extent of $p\pi-p\pi$ back-bonding between the halogen atom and the boron atom. In $BF_3$

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$BF_3$

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(D) The basicity of boron trihalides $(BX_3)$ depends on the extent of $p\pi-p\pi$ back-bonding between the halogen atom and the boron atom. In $BF_3$,the fluorine atom has a small size and its $2p$ orbitals overlap effectively with the empty $2p$ orbital of boron,leading to the strongest back-bonding. This reduces the electron-deficient nature of boron,making $BF_3$ the least basic among the given trihalides. Therefore,the order of basicity is $BF_3 < BCl_3 < BBr_3 < BI_3$.

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