20. (2 pts) Which of the following is true of free-radical halogenation of alkan
ID: 706213 • Letter: 2
Question
20. (2 pts) Which of the following is true of free-radical halogenation of alkanes? (circle ALL that apply) A. Chlorination is slower than bromination B. The propagation step of chlorination is endothermic C. The propagation step of bromination is exothermic D. Chlorination of propane will give one major product E. Bromination of butane will yield 2 unique stereoisomers F. none of the above 21. (3 pts) How many unique major products are expected from the reaction below, including stereoisomers? Hint: allylic radicals have two major resonance structures NBS A. 1 B. 4 C.8 D. 16 E. none of the above 22. (3 pts) Predict the major product of the reaction below Br Br Br E. none of the above 23. (3 pts) Predict the major product(s) of the reaction below HBr E. none of the aboveExplanation / Answer
21. Option C, 8
22. Option C, By tertiary radical formation
23. Option C, By Anti-Markonikoff rule
24. Option B, by Markonikoff rule
25. Option A, 1,2-addition
26. Option D, Cis dienes are good for Diels Alder reaction than trans diene
27. Option C, stereochemistry(cis) of dienophile retains in the product in Diels Alder reaction
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