Which of the following cannot give iodometric titrations?

Options

A. (a)`Fe^(3+)`
B. (b)`Cu^(3+)`
C. (c )`Pb^(2+)`
D. (d)`Ag^(+)`

Answer

C

Explanation

Atom in highest oxidation state can oxidize iodide to liberate `I_(2)` which is volumetrically measured by iodometric titration using hypo.
`2I^(-) rarr I_(2)`
`Pb^(+2)` Lowest oxidation state cannot oxidise iodide to `I_(2)`.