Of the following sets which one does NOT contain isoelectronic species?

Question

$BO_3^{3 - }$, $CO_3^{2 - }$, $NO_3^{- }$

$SO_3^{2 - }$, $CO_3^{2 - }$, $NO_3^{-}$

$CN^{- }$, $N_2$, $C_2^{2 - }$

$PO_4^{3 - }$, $SO_4^{2 - }$, $ClO_4^{ - }$

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