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Question

Which of the following has an incorrect order of listed properties?

A
F2>Cl2>Br2>I2 : Bond dissociation energy
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B
F2>Cl2>Br2>I2 : Oxidising power
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C
F>Cl>Br>I : Electron gain enthalpy
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D
F>Cl>Br>I : Electronegativity
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Solution

The correct option is C F>Cl>Br>I : Electron gain enthalpy
The correct order of bond dissociation energy is Cl2>Br2>F2>I2 because in F2 there is more inter-electronic repulsion because of which its bond becomes weak.

Oxidising power electronegativity
Thus the order of oxidising power is F2>Cl2>Br2>I2

Electron gain enthalpy: The amount of heat released when an extra electron is added.

electron gain enthalysizeinter electronic repulsion

The electron gain enthalpy of chlorine is greater because of less inter electronic repulsion than florine.
The correct order of electron gain enthalpy is Cl>F>Br>I

Down the group electronegativity decrease.

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