Organic Chemistry
8th Edition
ISBN: 9781305580350
Author: William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Publisher: Cengage Learning
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Chapter 21.2, Problem 21.3P
Interpretation Introduction
Interpretation:
The ground state electron configuration of cyclopentadienyl cation and the ground state electron configuration of cyclopentadienyl radical have to described, aromatic or antiaromatic has to be explained.
Concept introduction:
Aromaticity:
The organic molecule must planar, have one 2p orbitals on each atom of the ring, cyclic and conjugate and satisfy the 4n+2 electrons is called
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(c)
Calculate the n-electron energy of the pi electrons a pentadiene radical
The pentadienyl radical, H2C“CH¬CH“CH¬CH2#, has its unpaired electron delocalized over three carbon atoms.(a) Use resonance forms to show which three carbon atoms bear the unpaired electron.(b) How many MOs are there in the molecular orbital picture of the pentadienyl radical?(c) How many nodes are there in the lowest-energy MO of the pentadienyl system? How many in the highest-energy MO?(d) Draw the MOs of the pentadienyl system in order of increasing energy
The pentadienyl radical, H2C“CH¬CH“CH¬CH2#, has its unpaired electron delocalized over three carbon atoms.(a) Use resonance forms to show which three carbon atoms bear the unpaired electron.(b) How many MOs are there in the molecular orbital picture of the pentadienyl radical?(c) How many nodes are there in the lowest-energy MO of the pentadienyl system? How many in the highest-energy MO?(d) Draw the MOs of the pentadienyl system in order of increasing energy. (continued)762 CHAPTER 15 Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy(e) Show how many electrons are in each MO for the pentadienyl radical (ground state).(f) Show how your molecular orbital picture agrees with the resonance picture showing delocalization of the unpairedelectron onto three carbon atoms.(g) Remove the highest-energy electron from the pentadienyl radical to give the pentadienyl cation. Which carbon atomsshare the positive charge? Does this picture agree with the resonance picture?(h) Add an…
Chapter 21 Solutions
Organic Chemistry
Ch. 21.2 - Construct a Frost circle for a planar...Ch. 21.2 - Which compound gives a signal in the 1H-NMR...Ch. 21.2 - Prob. 21.3PCh. 21.2 - Prob. 21.4PCh. 21.3 - Prob. 21.5PCh. 21.4 - Arrange these compounds in order of increasing...Ch. 21.4 - Prob. AQCh. 21.4 - Prob. BQCh. 21.4 - Prob. CQCh. 21.5 - Prob. 21.7P
Ch. 21 - Name the following compounds and ions.Ch. 21 - Prob. 21.9PCh. 21 - Draw a structural formula for each compound. (a)...Ch. 21 - Molecules of 6,6-dinitrobiphenyl-2,2-dicarboxylic...Ch. 21 - Following each name is the number of Kekul...Ch. 21 - Prob. 21.13PCh. 21 - Prob. 21.14PCh. 21 - Prob. 21.15PCh. 21 - Which of the molecules and ions given in Problem...Ch. 21 - Prob. 21.17PCh. 21 - Naphthalene and azulene are constitutional isomers...Ch. 21 - Prob. 21.19PCh. 21 - Prob. 21.20PCh. 21 - Following are IR and 1H-NMR spectra of compound D....Ch. 21 - Compound E (C8H10O2) is a neutral solid. Its mass...Ch. 21 - Following are 1H-NMR and 13C-NMR spectral data for...Ch. 21 - Following are 1H-NMR and 13C-NMR spectral data for...Ch. 21 - Compound H (C8H6O3) gives a precipitate when...Ch. 21 - Compound I (C11H14O2) is insoluble in water,...Ch. 21 - Propose a structural formula for compound J...Ch. 21 - Propose a structural formula for the analgesic...Ch. 21 - Prob. 21.29PCh. 21 - Prob. 21.30PCh. 21 - Given here are 1H-NMR and 13C-NMR spectral data...Ch. 21 - Prob. 21.32PCh. 21 - Prob. 21.33PCh. 21 - Prob. 21.34PCh. 21 - Arrange the molecules and ions in each set in...Ch. 21 - Prob. 21.36PCh. 21 - Prob. 21.37PCh. 21 - From each pair, select the stronger base.Ch. 21 - Prob. 21.39PCh. 21 - Prob. 21.40PCh. 21 - Prob. 21.41PCh. 21 - Prob. 21.42PCh. 21 - Following is an equation for iodination of...Ch. 21 - Prob. 21.44PCh. 21 - Prob. 21.45PCh. 21 - Prob. 21.46PCh. 21 - When warmed in dilute sulfuric acid,...Ch. 21 - In the chemical synthesis of DNA and RNA, hydroxyl...Ch. 21 - Prob. 21.49PCh. 21 - Write the products of the following sequences of...Ch. 21 - Prob. 21.51PCh. 21 - Show how to convert 1-phenylpropane into the...Ch. 21 - Prob. 21.53PCh. 21 - Cromolyn sodium, developed in the 1960s, has been...Ch. 21 - Prob. 21.55PCh. 21 - Prob. 21.56PCh. 21 - Prob. 21.57PCh. 21 - Prob. 21.58PCh. 21 - Prob. 21.59PCh. 21 - Prob. 21.60PCh. 21 - Prob. 21.61PCh. 21 - Prob. 21.62PCh. 21 - Prob. 21.63PCh. 21 - Following is a synthesis for toremifene, a...
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Similar questions
- Why is benzene less reactive than hexane in terms of stability of free radicals?arrow_forwardThe pentadienyl radical, H2C“CH¬CH“CH¬CH2#, has its unpaired electron delocalized over three carbon atoms.(a) Use resonance forms to show which three carbon atoms bear the unpaired electron.(b) How many MOs are there in the molecular orbital picture of the pentadienyl radical?arrow_forwardThe unsaturation number or degree of unsaturation (U) can be used to determine the number of rings and multiple bonds in a compound from its molecular formula. Given a structure, you can determine the number of hydrogens without having to count them explicitly. Consider three compounds and their degree of unsaturation. (a) A compound A has the molecular formula C7H13ClN2OC7H13ClN2O. How many rings and/or π bonds does it contain?arrow_forward
- Write a conformational structure for 1,2,3-trimethylcyclohexane in which all the methyl groups are axial and then show its more stable conformation.arrow_forwardn of the following molecules could be considered aromatic? Assume all of the compounds are planar. T: Are these proper Lewis structures? ZI NH₂ N HBarrow_forwardExplain the Carbon-Carbon σ Bond Length in Buta- 1,3-diene ?arrow_forward
- Provide the bond-line structure of (Z)-4,5-dichloro-2-pentene.arrow_forwardDraw the structures of 1,3-pentadiene and 1,4-pentadiene and label the carbons. Predict the trendin C-C single bond lengths in the two compounds.arrow_forwardUse a sheet of paper and draw structures for all the isolated, conjugated, and cumulated dienes of molecular formula C5Hg.arrow_forward
- Estimate the heat released when 1-butene(CH3CH2CHCH2) reacts with bromine to give CH3CH2CHBrCH2Br. Bond enthalpies are CH : 412 kJ/mol; CC : 348 kJ/mol;CC : 612 kJ/mol; CBr : 276 kJ/mol;BrBr : 193 kJ/mol. 1.317 kJ/mol 2.507 kJ/mol 3.95 kJ/mol 4.288 kJ/mol 5.181 kJ/molarrow_forwardDefine the consequence of resonance stabilization ?arrow_forwardSpecify whether the two structures are resonance contributors to the same resonance hybrid. Be sure to explain your reasoning. If yes, be sure to specify which is preferred and why. H2C=NH2arrow_forward
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