Question

Which one of the following arrangements does not give the correct picture of the trends indicated against it ?
(i) F₂ > Cl₂ > Br₂ > I₂ : Oxidizing power
(ii) F₂ > Cl₂ > Br₂ > I₂ : Electron gain enthalpy
(iii) F₂ > Cl₂ > Br₂ > I₂ : Bond dissociation energy
(iv) F₂ > Cl₂ > Br₂ > I₂ : Electronegativity.
(a) (ii) and (iv) (b) (i) and (iii)
(c) (ii) and (iii) (d) (ii), (iii) and (iv)

Answer 1

(c) From the given options we find option (a) is correct. The oxidising power of halogens follow the order F₂ > Cl₂ > Br₂ > I₂ . Option (b) is incorrect because it in not the correct order of electron gain enthalpy of halogens. The correct order is Cl₂ > F₂ > Br₂ > I₂ . The low value of F₂ than Cl₂ is due to its small size. Option (c) is incorrect. The correct order of bond dissociation energies of halogens is Cl₂ > Br₂ > F₂ > I₂ . Option (d) is correct. It is the correct order of electronegativity values of halogens. Thus option (b) and (c) are incorrect