Question

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

A

${\mathrm{NF}}_{3}$

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B

${\mathrm{NCl}}_{3}$

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C

${\mathrm{NBr}}_{3}$

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D

${\mathrm{NI}}_{3}$

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Solution

## The correct option is A ${\mathrm{NF}}_{3}$The explanation for the correct option:A. ${\mathrm{NF}}_{3}$Trihalides of Nitrogen:Trihalides of nitrogen are Lewis bases as the nitrogen atom has one unshared pair of electrons.Trihalides are unstable in nature due to the large size of halogens.The bonding between the nitrogen atom and halogen gets weaker due to the difference in electronegativity between atoms.The trend for Trihalides of Nitrogen:Nitrogen trifluoride is the least basic in nature as fluorine has the highest electronegativity amongst halogens.Thus, the trend for the basicity in trihalides of nitrogen will be: ${\mathrm{NF}}_{3}<{\mathrm{NCl}}_{3}<{\mathrm{NBr}}_{3}<{\mathrm{NI}}_{3}$The explanation for incorrect options:Since, ${\mathrm{NF}}_{3}$ is the least basic in nature among all the trihalides of nitrogen. thus options B, C, and D stand incorrect.Hence, the correct option is A.

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