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- 5. Draw the product and predict the position of the equilibrium for the following sigmatropic shifts کرے 1Which of the following compounds fits the proton NMR shown below? 2H 4.0 || A) CH₂CH₂CH₂COCH 3 || B) CH3CH₂COCH₂CH3 0 || C) CH3COCH₂CH₂CH3 0 || D) CH3CCH₂CH₂OCH₂ 3.0 3H 2.0 2H 3H 1.0 ppmBased on this ¹H NMR spectrum, choose the compound that is the most likely to match the integration, shift, and multiplicity. PAU OCH₂ OCH₂ A) I B) II C) III D) IV
- Which compound is consistent with the spectrum below? он HO NH2 (A) N(CH3)2 (B) H. (D) (C) LOD 4D00 3000 200 1500 1000 S00 AVENUNG ERI Compound A TEENSMETTRNCEIНА ОН HB 2-indanol ОН -HA 1-indanol - Нв (b) Estimate the ¹H chemical shift for HB of 2-indanol and HA of 1-indanol. Is one more downfield than the other or are they expected to be similar? Explain your answer.NH2 A B Proton NMR: 2.7 (triplet, 2H), 1.7 (nonet, 1H), 1.5 (quintet, 2H), 1.4 (broad singlet, 2H), 1.2 (quartet, 2H), 0.9 (doublet, 6H) Carbon-13 NMR: 44, 37, 30, 28, 23 IR (below): D 4D00 3000 2000 1500 1000 500 HAVENUMB ERI I-Z I-Z TRANSHETTANCEI
- What are the most characteristic peaks to look for in the infrared spectrum of the product? (Williamson Ether Synthesis Reaction) a) a strong peak at 2200 cm-1 b) one strong peak at 1250 cm-1 c) two strong peaks at 1100 and 1200 cm-1How many ¹HNMR signals will observe for 4-bromo-4-methylcyclopent-2-en-1-one? (a) 5 (b) 4 (c) 6 (d) 3CH3 2. An unknown isomer of C4H9Cl has the ¹³C NMR and DEPT-135 spectra shown below: 13C NMR: 90 70 |||| A 50 8 (ppm) CH3CH₂CH₂ CH₂ CI 30 10 DEPT-135: CH3 CH3-CHCH₂-CI B 90 70 Circle the compound that is represented by these spectra. Clearly explain your reasoning. you will need to explain how each of the other three isomers was eliminated from consideration. 50 8 (ppm) CH3CH₂ CH-CI CH3 C 30 10 CH3 CH3-C-CI CH3 D
- 3. For the given molecules 1 H NMR (a) label all the hydrogen atoms, (b) State how many signals are possible (c) Predict chemical shift values (d) and Multiplicity. CH, *CH, 1-pentene 3-methylbutanal p-ethylanisole HO, Br butanoic acid 2-bromobutane diethyl malonate OH Br 1-propanol 1-bromopropane diethyl ethylmalonate2. What is the structure of 3-methylcyclohexanone? II II IV А) I B) П С) II D) IV 3. Using IR spectroscopy, how can you tell the difference between a ketone and an aldehyde? A) A ketone has no carbonyl stretch at 1720 cm-!. B) An aldehyde has a carbonyl stretch at 1820 cm-1. C) An aldehyde has two C-H stretches between 2700-2850 cm-1. D) A ketone has no C-H stretches. 4. Why can't you use acidic conditions (such as aqueous hydrochloric acid) for the addition of a Grignard reagent to a ketone? A) Because the Grignard reagent will react with the acid and be quenched. B) Because the ketone will be protonated and thus unreactive. C) Because the ketone will form an unreactive enol. D) Because the Grignard reagent won't dissolve in aqueous solutions.Can u answer b and c and can u draw the Hnmr and C nmr and elaborate ur answers pls thank u