Assertion: A chelating ligand must possess two or more lone pairs at such a distance that it may form suitable strain free 5 and 6 membered rings with the metal ion.
Reason: H2N- NH2 is a chelating ligand.
Answer & explanation
Correct answer: option 3
H2N−NH2 does not act as a chelating ligand. The coordinates by hydrazine lead to a three-member highly unstable strained ring and thus it does not act as a chelating agent.
A chelating ligand must possess two or more lone pairs at such a distance that it may form suitable strain-free rings at the metal ion.