Q.
Which one of the following arrangements does not give the, correct picture of the trends indicated against it?
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a
F2>Cl2>Br2>I2: Bond dissociation energy
b
F2>Cl2>Br2>I2:Oxidising power
c
F>Cl>Br>I: Electron gain enthalpy
d
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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