First slide

Group-17 or Halogen family

Question

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

Moderate

A

$F_{2} > {Cl}_{2} > {Br}_{2} > I_{2} :$ Bond dissociation energy
B

$F_{2} > {Cl}_{2} > {Br}_{2} > I_{2} :$ Oxidising power
C

$F > Cl > Br > I :$ Electron gain enthalpy
D

$F_{2} > {Cl}_{2} > {Br}_{2} > I_{2} :$ Electronegativity

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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