Which statement is incorrect?

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(C) $1$. $Cu^{+2}$ is a strong enough oxidizing agent to oxidize $I^{-}$ to $I_2$ $(2Cu^{+2} + 4I^{-} \rightarrow 2CuI + I_2)$. This statement is corr

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$MnF_7$ exists

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(C) $1$. $Cu^{+2}$ is a strong enough oxidizing agent to oxidize $I^{-}$ to $I_2$ $(2Cu^{+2} + 4I^{-} \rightarrow 2CuI + I_2)$. This statement is correct.$2$. $MnO_3F$ is a known compound where manganese is in the $+7$ oxidation state. This statement is correct.$3$. $MnF_7$ does not exist because fluorine is not capable of stabilizing the $+7$ oxidation state of manganese in a heptahalide form due to steric hindrance and electronic factors. This statement is incorrect.$4$. $MnF_4$ is a known compound of manganese. This statement is correct.

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The highest oxidation state of manganese in fluorides is $+4$ $(MnF_4)$, but the highest oxidation state in oxides is $+7$ $(Mn_2O_7)$, because

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