Which of the following order is correct for t | vedclass

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(C) $1$. Option $A$: $S^{2-}, Cl^{-}, K^{+}, Ca^{2+}$ are isoelectronic species with $18$ electrons. Ionisation energy increases as the nuclear charge

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$B > Al > Ga > In > Tl$ (Electronegativity)

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(C) $1$. Option $A$: $S^{2-}, Cl^{-}, K^{+}, Ca^{2+}$ are isoelectronic species with $18$ electrons. Ionisation energy increases as the nuclear charge $(Z)$ increases. The order should be $Ca^{2+} > K^{+} > Cl^{-} > S^{2-}$. Thus,$A$ is incorrect.$2$. Option $B$: The $2^{nd}$ ionisation energy involves removing an electron from a cation. For $C^{+}$,$N^{+}$,$O^{+}$,$F^{+}$,the order is $C $3$. Option $C$: Electronegativity generally decreases down a group. The order $B > Al > Ga > In > Tl$ is correct as it follows the group trend.$4$. Option $D$: Ionic radius for isoelectronic species decreases as nuclear charge increases. The correct order is $Na^{+} > Mg^{2+} > Al^{3+}$ and $Li^{+} > Be^{2+}$. The given order is incorrect.

Which of the following order is correct for the property mentioned in brackets?

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