In which of the following options the order of arrangement does not agree with the variation of property indicated against it?1) I < Br < Cl < F (increasing electron gain enthalpy)2) Li < Na < K < Rb (increasing metallic radius)3) Al3+ < Mg2+ < Na+ < F -1(increasing ionic size)4) B < C < N < O (increasing first ionization enthalpy)

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1, 4

1, 3

2, 3, 4

3, 4

answer is A.

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Detailed Solution

Cl has high electron affinity than F, F has small size, N has half filled configuration in hence it has high I.E.

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