18. Which characterizes this 22. Which is a step in the mechanism of this reacti

Question

18. Which characterizes this 22. Which is a step in the mechanism of this reactioe? (A) (B) two chiral centers one chiral center (C) meso compound Which is an E alkene? (A) B (D) achiral CHJCH CH2 19. (C) C Br 23. Which bromide (RBr) would react fastest in the S,2 20. Reaction of D-()-ribos reaction shown? with sodium borohydride H OH D-(-)ribose (A) a product with (+) optical rotation. (B) a product with optical rotation. (C) a racemic mixture (D) a meso compound 24. Which alcobol reacts fastest with HCT to yield an allyl 21. What is the product of this reaction? Br heat Which of the following undergoes the most rapid nucleophilic substitution with hydroxide ion? 25. CI Ci OCH3 26. Which reaction conditions would accomplish this only alkene product) C) CH.1.ZnCu) (D) 1. LIAIH. 2.CH,OH

Explanation / Answer

18. C

The given structure have 3 stereocentres not one or two. And it is superimposable on its mirror image. Hence, it is a Meso compound.

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