Question

In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

• A. I < Br < F < Cl (increasing magnitude of electron gain enthalpy)
• B. Li < Na < K < Rb (increasing metallic radius)
• C. Al³⁺ < Mg²⁺ < Na⁺ < F (order of ionic radius)
• D. B < C < N < O (increasing first ionization enthalpy)

Answer 1

Answer: (D)

As the correct order of increasing first ionisation enthalpy is B < C < O < N so option D is wrong. Rest other options are correct.