Assertion: $\mathrm{NF}_3$ is a weaker ligand than $\mathrm{N}\left(\mathrm{CH}_3\right)_3$. Reason :…

Assertion: $\mathrm{NF}_3$ is a weaker ligand than $\mathrm{N}\left(\mathrm{CH}_3\right)_3$. Reason : $\mathrm{NF}_3$ ionizes to give $\mathrm{F}^{-}$ions in aqueous solution.
  1. If both assertion and reason are true and the reason is the correct explanation of the assertion
  2. If both assertion and reason are true and the reason is not the correct explanation of the assertion
  3. If assertion is true but reason is false
  4. If both assertion and reason are false.

Solution

Due to high electronegativity of F-atoms, the lone pair of $\mathrm{N}$-atom in $\mathrm{NF}_3$ molecule cannot be ligated easily. Except, nitrogen fluoride, all other halides hydrolyse in water. $\mathrm{NCl}_3+3 \mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{NH}_3+3 \mathrm{HClO} \text {. }$

Asked in: NEET 2007

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