Answer
a) oxygen difluoride
b) disulfur decafluoride
c) sulfur trioxide
d) sulfur hexafluoride
Work Step by Step
a) oxygen difluoride-OF2 (one oxygen, two fluorine) also called as Difluorine monoxide
b) disulfur decafluoride-S2F10 (two sulfur, ten fluorine)
c) sulfur trioxide-SO3 (one sulfur, three oxygen)
d) sulfur hexafluoride-SF6 (one sulfur, six fluorine)