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Aromaticity Page 19 of 90 14. Which of these structures can be classified as aromatic? (A)...
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Which of these substances is classified as aromatic? Assume all structures are planar. :S: NV Select one: a. None of these b. I, II, and III c. I and Ill only d. I and Il only e. I only
25. Which structures are aromatic? Make your call based on the electron distributions shown here, not on possible resonance structures. :0: = a) II, III b) III, IV c) I, III d) I, IV Chem 236 Spring 2020 26. Arrange the compounds in order of increasing reactivity toward electrophilic aromatic substitution (lowest first). a) III <I<IV<II b) I<III < II <IV c) II<I<IV <III d) III <II <I<IV
Which structures are aromatic? Make your call based on
the electron distributions shown here, not on possible resonance
structures.
Which structures are aromatic? Make your call based on the electron distributions shown here, not on possible resonance structures. :o: h I, IV II, III III, IV Ο Ι, ΙΙΙ
Which of the following
structures are reasonable monomers for addition polymerization?
13. Which of the following structures are reasonable monomers for addition polymerization? CH2OH CI H O OH он H2N Ol H C 2 он (iv) IV (a) i only (b) ii and iv (c) ii, iii, and iv (d) i and iii (e) iii only
12. Identify which ammonium ion has the lower pka. Use aromaticity concepts to explain your answers.(3pts) 13. What is the Hückel number of pi electrons for the molecule shown below? How many pi electron pairs does it have? Would you expect this molecule to be aromatic, antiaromatic or non aromatic? Explain. (3pts) 14. The rate of solvolysis of iodide 1 is 100 times faster than the rate of solvolysis of iodide 3. What explanation (with structures) can you provide for...
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41. Which molecule(s) is/are aromatic? I1 IV (A) I only (C) I, III, and IV (B) I and IV (D) I, II, III, and IV OH OH 42. Which Fischer projection represents this structure? HO OH OH H CHO CHO (A) H-OH (B) HOH HOH CH2OH CH2OH CHO HOH CHO но -н CH2OH CH2OH 43. Which is a product of this ozonolysis reaction? 1.03 2. (CH3)2S H O I BHs/THF...
The nitrite ion can be represented as a resonance hybrid of
two significant Lewis structures. Which statements about this are
correct ? Please explain Why ?
(A) CO (B) HCN (C) NH (D) P 50. The nitrite ion, NO2 can be represented as a resonance hybrid of two significant Lewis structures. Which statements about this are correct? I. The two resonance structures contribute equally to th structure. II. The formal charge of nitrogen is zero in both resonance structures. (A)...
1. Which of the following structures is/are a secondary alkyl
halide? (a) I and II (b) II and V (c) I, II and V (d) IV only (e)
I, II and III 2. Which of the following is/are aprotic solvent(s)?
Choose all correct answers. (a) (b) (c) (d) (e) (f) 3. Which of the
following carbocations, if formed, is (are) likely to undergo
rearrangement through a hydride shift? (a) I (b) II (c) III (d) I
and II (e) II...
19. What is the major organic product obtained from the following reaction? Huso A) 1 B) II C III D) IV 20. What is the major organic product obtained from the following reaction? o ca A) I B) II C III D) IV 21. Which of the following substituents are activators in electrophilic aromatic substitution? A) CH30— B) CI— C) NO2 D) HSO3- 22. Which of the following substituents are deactivators in electrophilic aromatic substitution? A) HO– B) CH3NH –...
Which of the following compounds are aromatic? 25. NH2 N: Which of the following structures, if flat, would be classified as antiaromatic? 26. HN 11 and Ⅳ (C) IV and V (D) only Ⅳ (B) only 11 (A) l and 111 Which nitrogen atoms are basic? 27. (A) 1 and 3(B) 2 and 4 H. (D)2,4,and5 (C) 1,3, and5 Nitrogen's lone pair electrons occupy what type of orbital in pyridine? 28. (A)s (B)p () sp(D)sp (E) sp
Which of the...