(a) 6. Shown below are incomplete acid-base reactions. The molecules playing the role of acid and base have been labelled, but no products have been shown. a. Draw a curved arrow mechanism to account for the flow of electrons in each of the acid base reactions (be sure to draw in lone pairs, as needed). b. Draw the products of each reaction and label each product as the "conjugate acid" or "conjugate base." (b) OH base + Дон H acid HO base H NH2 H acid Hint: Consider conjugate acid stability when deciding whether the oxygen or nitrogen should act as the base.

2.1) Draw the structure of "major organic final product" of the following Addition of H₂O to alkyne reaction. The chemical structure must have the correct number of carbon atoms and functional group(s) to earn points. H3C-C=CH 1. (Sia)₂BH.THF 2. OH, H₂O2 Problem viewing the image. Click Here 2.2) Draw the structure of the "enol intermediate". 2.3) Draw the step-by-step curved arrow pushing mechanism of Tautomerization from "the enol intermediate to the major organic final product" under Base-Catalyzed condition. Your answer must include all related resonance contributors, and all lone pair electrons must be included in your drawing.

2. Which of the two compounds in each pair below is the stronger base? Explain using mechanistic reasoning. A A IZ B B

C341 Chapters (Acid-base chemistry) 9.) Acid-base equilibrium. For each reaction, perform the following tasks: a.) Complete the following reactions using the appropriate curved arrows to demonstrate the flow of electrons pairs in each potential reaction. b.) Indicate if the reaction lies to the right or the left (circle the correct arrow direction). c.) Calculate an approximate Ken for each reaction. d.) Write the pKa values under each acid, so we can evaluate your progress better and award partial credit. d.) Finally, label the acid (A), base (B), conjugate acid (CA) and base (CB) correctly based on the direction you decided. Keq = Direction: OH eg HO Keq = Direction: Keq = Direction: LOH OH ONa لها LIⒸ CHgLi Page 5 of 7