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Which of the following is true about [10]annulene? a. [10]annulene has 5 pi electrons b. [10]annulene...
Which of the following statements is NOT true? Each pair of pi electrons in benzene is delocalized over 6 carbons All of the C-C bond lengths in benzene are identical. Benzene has a very high delocalization energy (resonance energy) compared with acyclic polyenes. In the presence of a catalyst, benzene undergoes addition by bromine to give a dibromide product.
7. The number of π (pi) electrons in anthracene is: a. 6; b. 8; c. 10; d. 12; e. 14 8.Thiophene is a ---------------------------compound. A)Five membered carbocyclic B)Six membered heterocyclic C)Seven membered cyclic D)Five membered heteroaromatic E)Aliphatic 10.A four membered, cyclic, planar, completely conjugated compound with sp2 hybridized carbons and 4p (pi) electrons will be: a. Heteroaromatic b. Aromatic c.Nonaromatic d. Antiaromatic e. None of the above 21.The stability of the carbocations is as follow: A)1° carbocation > 2° carbocation...
2. Which of the following pi electrons in a cyclic compound meet the criteria of Hückel's rule? a. 4N b. 6N C. 4N42 d. 6N+2 3. From the following compounds having 10 pi electrons that meet Huckel's rule, circle on the aromatic ring. ??
Which of the following statements is true? Aromatic compounds release more energy per pi bond upon saturation than simple alkenes. Aromatic compounds release more energy on combustion than aliphatic compounds do. Aromatic compounds have shorter C-C bonds than CH2=CH2 Aromatic compounds do not react in radical halogenation as compared to aliphatic compounds
which is correct Which of the following is NOT true about redox reactions? Select one or more: I a. Redox reaction is a chemical reaction where electrons are transferred from one electron to the other. b. Lose electrons are oxidized to form hydrogen peroxide. c. Molecules that can donate electrons are called "reducing agents": d. Molecules lose electrons after the reaction is reduced
13. In the molecular orbital model of benzene, how many pi electrons are delocalized about the ring? A) 2 в) з C) 4 D) 5 E) 6 14, In the molecularorinl model of benzene,ow manypi electrons are in bonding molecular orbitals? A) 6 B) 5 C) 4 D) 3 E) 2 15. Cyelopentadiene is unusually acidic for a hydrocarbon. An explanation for this is the following statement A) The carbon atoms of cyclopentadiene are all sp'-hybridized B) Cyclopentadiene is aromatic....
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...
10. In which of the following reactions can rearrangements occur? A. The addition of Br and H,O to an alkene. B. The addition of Br to an alkene. C. The addition of H O to an alkene in the presence of HSO D. Rearrangements can occur in all of the abovelreactions. 11. Which of the following alkenes reacts the fastest with HCI? A. D. utc for hier P MacBook A
which of the following statement about water is not true a)water polar b)water not polar c) atoms in water share the distribution of electrons equally d) both b and c
Determine which of the following is True about what occurs at the anode of any voltaic cell. 1) Electrons enter the anode through the external circuit. ["True", "False"] 2) The mass (in grams) of the anode decreases as the reaction occurs (assuming that the anode is a reactant). ["False", "True"] 3) A substance undergoes oxidation. ["False", "True"]