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  4. Amongst the trihalides of nitrogen, which one is least basic?

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Q. Amongst the trihalides of nitrogen, which one is least basic?

IIT JEEIIT JEE 1987The p-Block Elements - Part2

Solution:

The electron withdrawing inductive effect of halogen decreases electron density on nitrogen, lowers basic strength. Since, fluorine is most electronegative, $NF_3$ is least basic.