The incorrect statement is:

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(D) . $Se$ $([Ar] 3d^{10} 4s^2 4p^4)$ and $As$ $([Ar] 3d^{10} 4s^2 4p^3)$. After removing one electron,$Se^+$ has $4p^3$ and $As^+$ has $4p^2$. Removi

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Halogens have the highest $I.E.$ in their respective periods.

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(D) . $Se$ $([Ar] 3d^{10} 4s^2 4p^4)$ and $As$ $([Ar] 3d^{10} 4s^2 4p^3)$. After removing one electron,$Se^+$ has $4p^3$ and $As^+$ has $4p^2$. Removing the second electron from $Se^+$ is harder due to the stable half-filled $p$-orbital,so this statement is correct.$B$. $C^{2+}$ has $1s^2 2s^2$ configuration,while $N^{2+}$ has $1s^2 2s^2 2p^1$. Removing an electron from the stable $2s^2$ shell of $C^{2+}$ requires more energy than from the $2p^1$ orbital of $N^{2+}$. This statement is correct.$C$. $F^{2+}$ has $1s^2 2s^2 2p^3$ and $O^{2+}$ has $1s^2 2s^2 2p^2$. Removing the third electron from $F^{2+}$ (half-filled $p$-orbital) is harder than from $O^{2+}$. This statement is correct.$D$. Noble gases have the highest $I.E.$ in their respective periods,not halogens. Therefore,this statement is incorrect.

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