Question

Which of the following arrangements does not represent the correct order of the property stated against it?

• A. \( V^{2+}<Cr^{2+}<Fe^{2+}<Mn^{2+} \): paramagnetic behaviour
• B. \( Ni^{2+}<Co^{2+}<Fe^{2+}<Mn^{2+} \): ionic size
• C. \( Co^{3+}<Fe^{3+}<Cr^{3+}<Sc^{3+} \): stability in aqueous solution
• D. \( Sc<Ti<Cr<Mn \): number of oxidation states

Hint:

The paramagnetic nature of transition metal ions is determined by the number of unpaired electrons. The correct order for paramagnetic behavior should be \( V^{2+}<Cr^{2+}<Fe^{2+}<Mn^{2+} \), but Fe\(^{2+} \) has fewer unpaired electrons than Mn\(^{2+}\), making the given order incorrect.