Correct Answer - D
(1)`Cl-undersetunderset(Br)(|)oversetoverset(F)(|)(C)-C-=(C)-l`
(2)`Cl-undersetunderset(I)(|)oversetoverset(F)(|)(C)-C-=C-Br`
(C )`Br-undersetunderset(I)(|)oversetoverset(F)(|)(C)-C-=C-Cl`
(4)`Br-undersetunderset(I)(|)oversetoverset(Cl)(|)(C)-C-=C-F`