Which of the following orders is not correct with respect to the property indicated against each?
A
F>Cl>Br>I→ electron gain enthalpy
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B
F−>Cl−>Br>I−→ enthalpy of hydration
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C
F2>Cl2>Br2>I2→ bond dissociation energy
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D
F2<CI2<Br2<I2→X−X bond lenght
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Solution
The correct option is DF>Cl>Br>I→ electron gain enthalpy
Electron Gain Enthalpy is the energy released when one mole of electron are added to gaseous atoms of an element.
The correct order of Electron gain enthalpy of Fluorine family is,
Cl>Br>F>I
The reason for this is that the size of fluorine atom is very small. So when an electron is added in the fluorine atom it will suffer more electro negativity as all the electrons will be very close to each other and hence the electron gain enthalpy of chlorine is more negative than that of fluorine.