In which of the following options order of arrangement does not agree with the variation of property indicated against it?(I) Al3+ < Mg2+ < Na+ < F− (Increasing ionic size)(II) B < C < N < O (Increasing first ionisation enthalpy)(III) I < Br < Cl < F (Increasing electron gain enthalpy)(IV) Li < Na < K < Rb (Increasing metallic radius)

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II and III

I and IV

III and IV

I and II

answer is A.

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Detailed Solution

Due to greater stability of the half filled electronic configuration of nitrogen, its ionisation enthalpy is higher than that of oxygen. Thus (II) is incorrect.Due to stronger electron-electron repulsions and small size of fluorine the negative electron gain enthalpy of fluorine is lesser than that of chlorine. Thus (III) is incorrect.

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