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

1. Al3+ < Mg2+ < Na+ < F− (increasing ionic size)
2. B < C < N < O (increasing first ionisation enthalpy)
3. I < Br < F < Cl (increasing electron gain enthalpy)
4. Li < Na < K < Rb (increasing metallic radius)

Correct answer: I < Br < F < Cl (increasing electron gain enthalpy)

Solution

The correct order for increasing electron gain enthalpy is F < Cl < Br < I, as fluorine has a lower electron gain enthalpy than chlorine due to its small size and high electron-electron repulsion. Thus, option C is incorrect.

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