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Question

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


A

NF3

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B

NCl3

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C

NBr3

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D

NI3

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Solution

The correct option is A

NF3


The explanation for the correct option:

A. NF3

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:

NF3<NCl3<NBr3<NI3

The explanation for incorrect options:

Since, NF3 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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