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Electron gain enthalpy of Cl is greater than F

Ionization enthalpy of Na is greater than Cs

Electronegativity of Cl is greater than F

Atomic radii of Br is greater than Cl

answer is C.

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Detailed Solution

Electronegativity order is I < Br < Cl < F. Although, electron gain enthalpy of Cl is greater than F because of the small size of F but still the electronegativity of F is higher than Cl.

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