Option (ii) and (iiii) are the answers.
For increasing first ionization enthalpy, the order should be:
B < C < O < N
For increasing electron gain enthalpy, the order should be:
I < Br < F < Cl
Option (ii) and (iiii) are the answers.
For increasing first ionization enthalpy, the order should be:
B < C < O < N
For increasing electron gain enthalpy, the order should be:
I < Br < F < Cl