Draw a Frost Circle for the following molecule. Determine whether it is aromatic and explain why in no more than 1 sentence.

Molecule A Molecule B Molecule A Molecule C Molecule D H₂C: Molecule C Which of the compounds shown is aromatic? CH₂ Molecule B Molecule D

Which one of the following statements from Chapter 8 and 18 is FALSE? O For a compound to be classified as aromatic, it must have an odd number of pairs of r-electrons and must be fully conjugated, cyclic and planar. O Inclusion of heteroatoms as part of the conjugated ring system renders the molecule to be considered non-aromatic. O Benzene is a six-membered ring where the r-electrons are equally shared across all six carbons in the ring and thus it possesses 36 kcal/mol of resonance stabilization energy. O All EAS reactions follow the same three mechanistic steps: (1) generate the electrophile, (2) capture the electrophile to give a carbocation intermediate, and (3) loss of a proton to regain aromaticity.

Draw both resonance structures of the anion formed by the reaction of the most acidic C-H bond of the compound below with base. • Include all valence lone pairs in your answer. . For structures having different hydrogens of comparable acidity, assume that the reaction occurs at the less-substituted carbon. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Separate resonance structures using the symbol from the drop-down menu. 0- O Bi % 5 T G ▾ 99-85 A 6 SCH₂CH3 ChemDoodleⓇ Cengage Learning Cengage Technical Support Y H F6 On [F & 7 O U J F7 * 8 PrtScn | K Home 9 83°F Sunny O L A End 0 F10 P IN Previous Next> C 4x PgUp F11 J Save and Exit 9:38 AM 7/18/2022 PgDn + = F12 80

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How many H-types do each of the following compounds have and label them. Circle the one that expected to be the most downfield.

Draw both resonance structures of the anion formed by the reaction of the most acidic C-H bond of the compound below with base. a Include all valence lone pairs in your answer. . For structures having different hydrogens of comparable acidity, assume that the reaction occurs at the less-substituted carbon • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Separate resonance structures using the symbol from the drop-down menu. . O CP