leic anhydride? be least reactive toward Diels-Alder addition ot S. In the struc
ID: 1027698 • Letter: L
Question
leic anhydride? be least reactive toward Diels-Alder addition ot S. In the structure shown, and R, aze classified as a. homotopic protons. b. vicinal protons. c. enantiotopic protons d. diastereotopic protons. e. isomeric protons. 6. The H NMR signal for vhich of the indicated protons Occurs furthest downfield? HC C-CH-CH-CH d. IV 7 How many 13c signals would 1,2-dimethy lbenzene give? a. 1 b. 2 c. 3 d. 4 e. 5 a. identical b. enantiotopic c. diastereotopic d. homotopic e. mesotopic In NMR terminology, protons B, and B, are said to be: 0%Explanation / Answer
4) option 5 is least reactive
Explanation: s-trans dienes are least reactive in Diels-Alder reaction.
5) option D is correct
Explanation: Hb and Hc on substitution method produces cis-trans isomers. cis-trans isomers are diastereomers. so Hb and Hc are diastereomers.
6) option E is correct
Explanation: aromtic protons appear at downfield region.
7) option D is correct
Explanation: The number of types of carbon atoms in the 1,2-dimethylbenzene are 4 so the number of 13C-signals are 4.
8) option C is correct
Explanation: They both are diastereotopic protons as they produce diastereomers on substitution method.
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