Which carbon-carbon bond in the following compound would you expect to be shortest? I II III...
Which of the following compounds would you expect to be antiaromatic? (i) cyclooctatetraene (ii) 1,3-cyclooctadiene (iii) cyclooctatetraenyl dianion (iv) 1-ethenylcyclooctatetraene (v) 1,3,5,7-octatetraene Select one: a. i only b. i, ii, iv and v only c. iii only d. i and iv only e. all the above From my working I found i, ii, iv, and v to be non aromatic and iii to be aromatic. Is non aromatic the same as antiaromatic?
Which of the following compounds would you expect to be antiaromatic? (i) cyclopropene (ii) cyclopropenyl anion (iii) cyclopropenyl cation (iv) 1,2-epoxyethene (v) 3-chlorocyclopropene
Which alkene would you expect to have the lowest heat of hydrogenation? III IV I II III IV Which pair does not represent a pair of resonance structures? and and and ШI IV and O I O II O III O IV All of these choices represent pairs of resonance structures.
5. Which of the following would you expect to have significant resonance stabilization energy? a) I b) II c) III d) all three of them I II IL e) II and III Z -I z 6. Of the following C-10 compounds, which is expected to possess the greatest resonance (delocalization) energy? II III IV 7. Which of the following would you expect to be antiaromatic? v I III IV e 9. Which of the following would NOT be aromatic? II...
Which product(s) would you expect to obtain from the following sequence of reactions? IV II I III V
Which compound would you NOT expect to be aromatic? :00: O: -I E I Д IV V ΟΙ Ο ΙΙ O III O IV O v
Which alkene would you expect to be most reactive toward acid-catalyzed hydration? CH_3=CHCH_2CH_3 I II III IV All of these would be equally reactive.
50. For the following compound how many different signals would you see in the proton NMR? (Assume that you can see them all.) A) 4 B) 5 C) 6 D) 7 E) 8 . An organic compound absorbs strongly in the IR at 1687 em. Its 'H NMR spectrum consists of two signals, a singlet at 2.1 ppm and a multiplet centered at 7.1 ppm. Its mass spectrum shows significant peaks at m/z 120, m/z 105 and m/z 77. This...
Which compound has the shortest carbon-carbon bond length? CH3CH3 CH2CH2 HCCH All bond lengths are the same.
Question 15 Which of the following would undergo epimerization in base? You ☺ II III IV A. I B. II C. III D. IV E. Both III and IV Question 16 What is the correct structure for 3-phenylpropanal? MY II H IV V ООООО CA. II B. C. IV D.V E. III