Which of the following process is exothermic?

(1)    .   .   .   IP of O(g)    .   .   .   endothermic(2)    .   .   .   2nd ∆Heg of S(g)   .  .   . endothermic(3)    .   .   .    IP3 of Al(g)    .   .   .  endothermic(4)    .   .   .   ∆Heg of F(g)   .   .   .  exothermic