Fex2 and Fey3 are known when x and y are :

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x=F,Cl,Br,I and y=F,Cl,Br

x=F,Cl,Br and y=F,Cl,Br,I

x=Cl,Br,I and y=F,Cl,Br,I

x=F,Cl,Br,I and y=F,Cl,Br,I

answer is A.

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Detailed Solution

Fe can form all types of dihalides but due to strong reducing nature of I-, FeI3 is not stable.

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