Which one of the following arrangements does not give the correct picture of the trends indicated against it ? (i) F 2 Cl 2 Br 2 I 2: Oxidizing power (ii) F 2 Cl 2 Br 2 I 2: Electron gain enthalpy (iii) F 2 Cl 2 Br 2 I 2. Bond dissociation energy (iv) F 2 Cl 2 Br 2 I 2: Electronegativity.

Question

Which one of the following arrangements does not give the correct picture of the trends indicated against it ? (i) F 2> Cl 2> Br 2> I 2: Oxidizing power (ii) F 2> Cl 2> Br 2> I 2: Electron gain enthalpy (iii) F 2> Cl 2> Br 2> I 2. Bond dissociation energy (iv) F 2> Cl 2> Br 2> I 2: Electronegativity. (A) (ii) and (iv) (B) (i) and (iii) (C) (ii) and (iii) (D) (ii), (iii) and (iv)

Tardigrade Admin · Accepted Answer

From the given options we find option (i) is correct. The oxidising power of halogens follow the order

F_{2} > C l_{2} > B r_{2} > I_{2}

. Option (ii) is incorrect because it is not the correct order of electron gain enthalpy of halogens. The correct order is

C l_{2} > F_{2} > B r_{2} > I_{2}

. The low value of

F_{2}

than

C l_{2}

is due to its small size.
Option (iii) is incorrect. The correct order of bond dissociation energies of halogens is

C l_{2} > B r_{2} > F_{2} > I_{2}

.
Option (iv) is correct. It is the correct order of electronegativity values of halogens.