Which halide of nitrogen is least basic?

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Question

(D) The basicity of nitrogen halides depends on the availability of the lone pair of electrons on the nitrogen atom. In $NF_3$,the fluorine atom is hi

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$NF_3$

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(D) The basicity of nitrogen halides depends on the availability of the lone pair of electrons on the nitrogen atom. In $NF_3$,the fluorine atom is highly electronegative. It exerts a strong $-I$ effect,which pulls the electron density of the lone pair on the nitrogen atom towards itself. This significantly reduces the availability of the lone pair for donation,making $NF_3$ the least basic among the nitrogen halides. As the electronegativity of the halogen decreases from $F$ to $I$,the $-I$ effect decreases,and the basicity increases.

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