Which one of the following arrangements does not give the, correct picture of the trends indicated against it?

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F2>Cl2>Br2>I2: Bond dissociation energy

F2>Cl2>Br2>I2:Oxidising power

F>Cl>Br>I: Electron gain enthalpy

F2>Cl2>Br2>I2:Electronegativity

answer is A.

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Detailed Solution

(1) Cl2>Br2>F2>I2: Bond dissociation energy.As we from top to bottom as atomic size increases Bond dissociation energy decreases but exception for F due to high electronegativity. Incorrect order.(2) F2>Cl2>Br2>I2: Oxidizing nature.As we from top to bottom as atomic size increases oxidizing nature decreases due to decrease in electronegativity. Correct order.(3) Cl2>F2>Br2>I2: Electron gain enthalpy. As we from top to bottom as atomic size increases and effective nuclear charge decreases and hence electron gain enthalpy decreases except for F due to high electronic repulsion. Incorrect order.4) F2>Cl2>Br2>I2: Electronegativity. As we from top to bottom as atomic size increases and electronegativity decreases. Correct order.

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