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  4. Which one of the following is least basic?

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Q. Which one of the following is least basic?

UP CPMTUP CPMT 2012The p-Block Elements - Part2

Solution:

$NF_3$ has least tendency to donate a pair of electrons (basicity) because of high electronegativity of $F$. The Lewis base strength of the other trihalides increases as the electronegativity of halogen decreases.