1) Up to group 7, the highest oxidation state is the same as the group number\ 2) +7 oxidation stat

Question

1) Up to group 7, the highest oxidation state is the same as the group number\ 2) +7 oxidation state of Mn is not represented in simple halides .\ 3) oxygen stabilises the highest oxidation state even more than fluorine.\ 4) All $\mathrm{Cu}(11)$ halides are well known The number of correct statements given above is\

Professor PC Thomas Classes · Answer

statement 4 is wrong. $\mathrm{Cu}(11)$ iodide is unstable and decomposes to $\mathrm{Cu}(1)$ iodide and iodine. The other statements are correct.\