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($A$) $\mathrm{C}_2^{2-}$ is expected to be diamagnetic
($B$) $\mathrm{O}_2{ }^{2+}$ is expected to have a longer bond length than $\mathrm{O}_2$
($C$) $\mathrm{N}_2^{+}$and $\mathrm{N}_2^{-}$have the same bond order
($D$) $\mathrm{He}_2^{+}$has the same energy as two isolated He atoms
$\mathrm{A}(l) \rightarrow 2 \mathrm{B}(\mathrm{g})$
$\Delta \mathrm{U}=2.1\; \mathrm{kcal}, \Delta \mathrm{S}=20\; \mathrm{cal} \mathrm{K}^{-1}$ at $300\; \mathrm{K}$
Hence $\Delta \mathrm{G}$ in $\mathrm{kcal}$ is