Which one of the following orders is not in accordance with the property stated against it ?

F 2 > Cl 2 > Br 2 > I 2 : Bond dissociation energy

F 2 > Cl 2 > Br 2 > I 2 : Oxidising power

HI > HBr > HCl > HF : Acidic property in water

F 2 > Cl 2 > Br 2 > I 2 : Electronegativity

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Periodic Table and Periodicity question

2006 · Q111

Periodic Table and Periodicity question

2006 · Q111

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Correct answer: A

$\mathop {F - F}\limits_{38} \,\,\,\mathop {Cl - Cl}\limits_{57} \,\,\mathop {Br - Br}\limits_{45.5} \,\,\mathop {I - I}\limits_{35.6}$
X - X bond dissociation energy (kcal/mol)

The lower value of bond dissociation energy of fluorine is due to the high inter-electronic repulsion between non-bonding electrons in the 2p-orbitals of fluorine. As a result F - F bond is weaker in comparison to Cl - Cl and Br - Br bonds.

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Periodic Table and Periodicity question

2006 · Q111

Periodic Table and Periodicity question

2006 · Q111

View written solutionFree

Correct answer: A

$\mathop {F - F}\limits_{38} \,\,\,\mathop {Cl - Cl}\limits_{57} \,\,\mathop {Br - Br}\limits_{45.5} \,\,\mathop {I - I}\limits_{35.6}$
X - X bond dissociation energy (kcal/mol)

The lower value of bond dissociation energy of fluorine is due to the high inter-electronic repulsion between non-bonding electrons in the 2p-orbitals of fluorine. As a result F - F bond is weaker in comparison to Cl - Cl and Br - Br bonds.