Question

Which of the following groupings represent isoelectronic species ?

(a) NO, CN^-, N₂, O₂^-

(b) NO⁺, C₂^2-, O₂^-, CO

(c) N₂, C₂^2-, CO, NO

(d) CO, NO⁺, CN^-, C₂^2-

Answer 1

Correct option is (d) CO, NO⁺, CN^-, C₂^2-

No. of electrons in CO = 6 + 7 + 1 = 14

No. of electrons in NO⁺ = 7 + 8 - 1 = 14

No. of electrons in CN = 6 + 7 + 1 = 14

No. of electrons in C₂^2- = 12 + 2 = 14