Which setsofionsis isoelectronic ?

1.	Which setsofionsis isoelectronic ?
Answer» `NO^(+) , C_(2)^(2) CN^(-)N_(2)` `CN^(-1)N_(2)O_(2) ^(-2)C_(2)^(-2)` `N_(2) ,O_(2)^(-1) NO^(+) CO ` `C_(2)^(-2) O_(2)^(-1)CO, No` Answer :A

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