The aromatic nucleic acids that comprise a portion of the RNA and DNA molecules are seen below. a) For each of the nucleic acids, draw any resonance structures that might suggest aromatic nature. (One of them is already completely aromatic). b) Indicate whether the electron pair is localized or delocalized for each nitrogen atom in adenine.

Draw the contributing structure that results from resonance indicated by the curved arrow(s). You do not have to consider stereochemistry. Explicitly draw all H atoms. You do not have to include lone pairs in your answer.

Also, highlight each bond in this structure that is cis but which could be trans in a different cis/trans isomer. If there are no such bonds, check the No bonds to highlight box under the drawing area. Note: be careful not to highlight a bond just because it's cis in this drawing! It also needs to be a bond that would create a different cis/trans isomer if it were changed to trans. This molecule has cis/trans isomers in all. G C

For the following Structure, a) draw in any missing lone pairs; b) identify and list the resonance patterns (i.e. allylic cation) present. If one pattern shows up more than once, list it multiple times c) draw curved arrows on the initial structure to produce a resonance structure, including formal charge. (hint - use a minimum of curved arrows for each resonance structure). Repeat on the second structure to generate a third structure. Rank the resonance structures in order of decreasing importance: 1 is most important, 2 is second most important, etc... H Pattern 1: Pattern 2: Rank: Pattern 1: Pattern 2: Rank: Pattern 1: Pattern 2: Rank: