11. Some ketones will racemize very rapidly in acidified water while the others retain their optical purity. Which one(s) racemize(s)? H3C CH3 CH3 1 2 3 A. 1 and 2 B. only 1 C. 1,3 and 4 D. 1,2 and 4 E. 1 and 4 CH3 'C2H5

H3C 1 H₂O₂, NaOH a. The presence of H₂O2 H3C. H3C. 2 What controls the stereochemical outcome of the reaction depicted above? 3 b. The presence of a pre-existing stereocenter c. The methyl group at the end of the chain d. The presence of an alkene in the reactant

What is the best set of reagents to achieve deoxygenation of 2-pentanone to pentane? A. NaClO2/NaH2PO4 B. LiAlH4, Et2O C. DIBAL-H, THF   D. NH2NH2/t-BuOK, DMSO

Give the organic product. dy I. II. OA I D. VV MeO₂C NaOMe CO₂Me CO₂Me P Note: Me= CH3 III. IV. OMe ço,Me

predict the major organic product(s), and tell me the stereochemistry of each product if theres any

M8

Consider the stereochemistry of the equimolar mixture of compounds and its optical activity. Flm H3C F Which statement is true? Select one: the mixture is optically active the optical activity of the mixture cannot be determined by the information presented the mixture is optically inactive

15. Consider the substitution reaction: The product(s) of the reaction is(are): a. R enantiomer C. d. HO-C (S)-2-bromononane H CH; A equimolar mixture of a and b. A mixture of the major product a with the minor product b. CH₂O CH₂OH b. Senantiomer HO-C CH;

What is the product? A) R-2-bromobutane A) S-2-bromobutane C) Racemic Mixture

4. Fill in the missing information (reactants, products, or reagents) in the following transformations. If more than one product is possible, draw structures for all products and indicate the major product. If stereoisomers are possible, draw all isomers, and indicate the major stereoisomer. + a. C. d. e. НО. НО. CI OH OH X PCC NaOCH HBr SOCI J.... CI OH Focus