8. If a resonance structure must have a negative formal charge, that charge is most stable on an electronegative atom. Draw all relevant resonance structures of the molecule below with curved arrows only using pattern 1. Circle the most stable structure(s). Explain the choice of most stable structure with 1-3 complete sentences.

2. Each resonance structure of a given molecule contributes to the resonance hybrid. The more stable the resonance structure, the more that resonance structure contributes to the resonance hybrid. For the following resonance structures, a. Circle the resonance structure that contributes most to the resonance hybrid. b. Explain your choice for a in complete sentences. c. Draw the resonance hybrid. d. Add curved arrows to indicate the flow of electrons in each structure except the D. H A Q Search B hyji C D

! ( plz answer with explanation)

Two resonance structures are possible for the anion shown. One resonance form is given, but it is incomplete. Complete the given structure by adding nonbonding electrons and formal charges. Draw the remaining resonance structure, including nonbonding electrons and formal charges. Omit curved arrows. Structure A: complete the structure by adding Structure B: draw the remaining resonance structure, nonbonding electrons and formal charges. including nonbonding electrons and formal charges. Rings Erase Select Draw Rings More Erase Select Draw More H // C H. H

2. Tetrahydrocannabinolic acid (THCA), the precursor to THC, a psvchoactive: H.. • This molecule is missing eight lone pairs. Add them to the structure above • Check the formal charges of the oxygen atoms above. Do any of them have a non-zero formal charge? If so, add the charges to the appropriate oxygen atoms • THCA is a weak acid. Identify and circle the acidic hydrogen on the above structure • Draw a resonance structure of this molecule below

One, or both, of the following structural formulas may be incorrect (i. e., they do not represent a real compound) because they have atoms with an incorrect number of bonds. Which of the labeled atoms have the incorrect number of bonds? Specify the incorrect atoms by letter in alphabetical order without spaces or commas., i.e. bd. If there are no incorrect atoms, write none. a) b) H H lb lc d -C-0-H a H-N -C H bN H H

a) Draw the Lewis structure for the molecule on the left (labeled as Molecule A above). Draw the Lewis structure which has minimum formal charges.  b) Draw the correct Lewis structure for the molecule on the right (labeled as Molecule B above). Draw the Lewis structure which has minimum formal charges. c) Select the three TRUE statements from those provided below. The molecule on the right (Molecule B) is planar (all atoms lie within the same plane). The molecule on the left (Molecule A) is planar (all atoms lie within the same plane). The molecule on the right (Molecule B) has polar bonds. The molecule on the left (Molecule A) has polar bonds. We can distinguish between the two molecules (Molecule A and Molecule B) based upon their dipole moment.

Tag all the carbon atoms with pi bonds in this molecule. If there are none, please check the box below. H | || :0: H-C- I H .. C-O-H There are none. X

Which of the following species is a valid resonance structure of A? Use curved arrows to show how A is converted to any valid resonance structure. When a compound is not a valid resonance structure of A, explain why not.

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