For each example, specify whether the two structures are resonance contributors to the same resonance hybrid.

For the species below draw additional resonance structures (where all atoms have access to an octect of electrons) for species A, B, C, and D. Determine the bond order of the bond from the underlined C to underlined O for the lowest energy structure(s). You may need to evaluate the formal charge of the additional species you draw. These are species in an aprotic solvent, so only electrons may be moved, not hydrogen atoms. For each lettered structure below, input the bond order as an integer (1,2,etc) or improper fraction (4/3, 5/4, etc). A Structure Bond Order A HO: (f) H B B С Which structure A-D has the longest underlined C-O bond? :N=C=0: D D

A) 1) One of the following four structural formulas is not a permissible resonance contributor which one? Why? на HC на a) b) NFO c) H₂C HC H.C H₂C ks 2) Using curved arrows, show the electron movement that connects the three resonance contributors. لوج شركة السار NFO

Circle the most stable resonance structure.