(26) The structure of domoic acid is shown below. What is the configuration of the chiral centers labelled 1 and 2? 2 b (a) R, R (b) RS COOH (c) SS (d) SR H- "COOH , (27) What is the charge of domoic acid at a pH = 1? (a) -1 (b) 0 (c) +1 (d) +2 (28)What are the the configurations of the double bonds labelled a and b? (a) E, E (b) E, Z (c) Z, Z (d) Z, E (29) Which of the following is an example of an enol? OH OH OH (a) (b) (c) (d) OH (30) Which of the following electrophiles will be the most reactive SN2 substrate? OMs LO-SO,CH3 (31) Which product arises from the E2 eliminationof 1-bromo-1,2-dimethylcyclohexane (asume Zaytset product forms). (c) (d) (a) (b)