AIIMS2015ChemistryCoordination Compounds
Assertion: NF ₃ is a weaker ligand than N ( CH ₃ )₃ . Reason : NF ₃ ionizes to give F ⁻ ions in aqueous solution.
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion.
- BIfboth assertion and reason are true but reason is not the correct explanation of assertion.
- CIf assertion is true but reason is false.
- DIf both assertion and reason are false.
Correct answer
C. If assertion is true but reason is false.
Step-by-step solution
Due to high electronegativity and electron withdrawing nature of F -atom, the lone pair of N -atom in NF ₃ molecule is not easily available for donation. Whereas in N ( CH ₃ )₃,- CH ₃ group is an electron releasing group, thus lone pair of N -atom in N ( CH ₃ )₃ molecule can be ligated easily. Except, nitrogen fluoride, all other trihalides hydrolyse in water. NCl ₃+3 H ₂ O NH ₃+3 HOCl