Q.

Which of the following order is correct

1 EF2/2F-∘<ECl2/2Cl-∘<EBr2/2Br-∘<EI2/2I-∘=Evalues∘ (SRP values)  
2 I>Br>Cl>F; Electron affinity  
3 F->Cl->Br->I-; |Hydration enthalpy|  
4 F2>Cl2>Br2>I2; Bond dissociation enthalpy  

Ans.

(3)

i)  F2 to I2; SRP values decreases

ii)  Cl>F>Br>I; electron affinity

iii)  Cl2>Br2>F2>I2; BDE