The pairs among A = [ SO ₃²⁻, CO ₃²⁻] , B = [ O ₂²⁻, F ₂] , C = [ CN ^-, CO ] , D = [ NH ₃, H ₃ O ^+] and E = [ MnO ₄²⁻, CrO ₄²⁻] that do not have similar Lewis dot structure are

Step-by-step solution

Species with the same number of valence electrons and the same skeletal structure generally have similar Lewis dot structures (isoelectronic species). For pair A: SO ₃²⁻ has 6 + 3(6) + 2 = 26 valence electrons. CO ₃²⁻ has 4 + 3(6) + 2 = 24 valence electrons. Since they have different numbers of valence electrons, they do not have similar Lewis dot structures ( SO ₃²⁻ has a lone pair on the central atom and is pyramidal, while CO ₃²⁻ has no lone pair on the central atom and is trigonal planar). For pair B: O ₂²⁻ has