Organic Chemistry (9th Edition)
9th Edition
ISBN: 9780321971371
Author: Leroy G. Wade, Jan W. Simek
Publisher: PEARSON
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Chapter 7, Problem 7.47SP
The energy difference between cis- and trans-but-2-ene is about 4 kJ/mol; however, the trans isomer of 4,4-dimethylpent-2-ene is nearly 16 kJ/mol more stable than the cis isomer. Explain this large difference.
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Chapter 7 Solutions
Organic Chemistry (9th Edition)
Ch. 7.3A - Prob. 7.1PCh. 7.3A - Prob. 7.2PCh. 7.3B - Draw five more compounds of formula C4H6NOC1.Ch. 7.3B - For each of the following molecular formulas,...Ch. 7.4 - Give the systematic (IUPAC) names of the following...Ch. 7.5B - The following names are all incorrect. Draw the...Ch. 7.5B - Prob. 7.8PCh. 7.5B - a. How many stereogcmc double bonds are in...Ch. 7.6 - Teflon-coated frying pans routinely endure...Ch. 7.7B - Prob. 7.11P
Ch. 7.8B - Use the data in Table7-2 to predict the energy...Ch. 7.8C - Prob. 7.13PCh. 7.8E - Explain why each of the following alkenes is...Ch. 7.8F - Prob. 7.15PCh. 7.10 - Prob. 7.16PCh. 7.10A - SN1 substitution and E1 elimination frequently...Ch. 7.10C - Prob. 7.18PCh. 7.10C - Prob. 7.19PCh. 7.10C - Prob. 7.20PCh. 7.11 - Prob. 7.21PCh. 7.11 - Prob. 7.22PCh. 7.12 - Prob. 7.23PCh. 7.12 - Prob. 7.24PCh. 7.13 - Prob. 7.25PCh. 7.14B - Prob. 7.26PCh. 7.14B - Make models of the blowing compounds, and predict...Ch. 7.15 - Prob. 7.28PCh. 7.15 - Prob. 7.29PCh. 7.15 - Prob. 7.30PCh. 7.15 - Prob. 7.31PCh. 7.16 - Predict the major and minor elimination products...Ch. 7.17B - Predict the products and mechanisms of the...Ch. 7.18 - Propose mechanisms for the following reactions.Ch. 7.18 - Prob. 7.35PCh. 7.19B - The dehydrogenation of butane to trans-but-2-ene...Ch. 7.19B - Prob. 7.37PCh. 7.19B - Prob. 7.38PCh. 7.19B - Prob. 7.39PCh. 7 - Prob. 7.40SPCh. 7 - Prob. 7.41SPCh. 7 - Prob. 7.42SPCh. 7 - Prob. 7.43SPCh. 7 - Prob. 7.44SPCh. 7 - Prob. 7.45SPCh. 7 - Prob. 7.46SPCh. 7 - The energy difference between cis- and...Ch. 7 - Prob. 7.48SPCh. 7 - Prob. 7.49SPCh. 7 - Prob. 7.50SPCh. 7 - What halides would undergo E2 dehydrohalogenation...Ch. 7 - Prob. 7.52SPCh. 7 - Prob. 7.53SPCh. 7 - Write a balanced equation for each reaction,...Ch. 7 - Prob. 7.55SPCh. 7 - Using cyclohexane as your starting material, show...Ch. 7 - Show how you would prepare cyclopentene from each...Ch. 7 - Prob. 7.58SPCh. 7 - E1 eliminations of alkyl halides are rarely useful...Ch. 7 - Prob. 7.60SPCh. 7 - Propose mechanisms for the following reactions....Ch. 7 - Prob. 7.62SPCh. 7 - Prob. 7.63SPCh. 7 - Prob. 7.64SPCh. 7 - Prob. 7.65SPCh. 7 - Prob. 7.66SPCh. 7 - Prob. 7.67SPCh. 7 - Prob. 7.68SPCh. 7 - Prob. 7.69SPCh. 7 - Explain the dramatic difference in rotational...Ch. 7 - One of the following dichloronorbornanes undergoes...Ch. 7 - A graduate student wanted to make...Ch. 7 - Prob. 7.73SPCh. 7 - Prob. 7.74SPCh. 7 - Prob. 7.75SPCh. 7 - Prob. 7.76SP
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- Why is a 1, 3 - cis disubstituted cyclohexane more stable than its trans isomer?arrow_forward3. The heat of hydrogenation for allene, H½C = C= CH2, to yield propane is – 295 kJ/mol, and the heat of hydrogenation for a typical monosubstituted alkene such as propene is -126 kJ/mol. Is allene more stable or less stable than you might expect for a diene ? Explain.arrow_forwardMatch each alkene to its heat of hydrogenation. Alkenes: 3-methylbut-1-ene, 2-methylbut-1-ene, 2-methylbut-2-ene ΔH° (hydrogenation) kJ/mol: –119, –127, –112arrow_forward
- Which of the following statement is false about conjugated systems? A conjugated system is more stable than an unconjugated A system. The s-trans isomer is favored over the s-cis isomer. A conjugated system has C multiple resonance structures. A conjugated system can only D contain two alkenes.arrow_forward4. A double bond in a six-membered ring is usually more stable in an endocyclic position than in an exocyclic position. Hydrogenation data on two pairs of compounds follow. One pair suggests that the energy difference between endocyclic and exocyclic double bonds is about 9 kJ/mol. The other pair suggests an energy difference of about 5 kJ/mol. Which number do you trust as being more representative of the actual energy difference? Explain your answer. endocyclic exоcyclic 107 116 105 110 heats of hydrogenation (kJ/mol)arrow_forward"A cis alkene is more polar than a trans alkene, giving it a slightlyhigher boiling point and making it more soluble in polar solvents" Explain this statement ?arrow_forward
- Draw the alkene that would react with the reagent given to account for the product formed. ? + + H₂O **** H₂S04 • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • In cases where there is more than one answer, just draw one. CH3 CH3 CHCCH3 | | OH CH3 +1arrow_forwardWhich is more stable, a 1,4 trans disubstituted cyclohexane or its cis isomer? Explainarrow_forwardThe heat of combustion of cis-1,2-dimethylcyclopropane is larger than that of the trans isomer. Which isomer is more stable? Use drawings to explain this difference instability.arrow_forward
- The energy difference between a tert-butyl group going from equatorial to axial in a cyclohexane is 18.3 kJ/mol. When two of the carbon atoms are replaced with oxygen atoms (molecule B) the energy difference between the two chair conformations drops to 5.9 kJ/mol. Explain this difference. (Hint: Consider what makes putting groups axial unfavorable).arrow_forward7. What kinds of isomers are the following pairs? (a) (S)-5-Chlorohex-2-ene and chlorocyclohexane (b) (2R,3R)-Dibromopentane and (2S,3R)-dibromopentanearrow_forwardWhich one alkene will exhibit cis-trans isomerism? A B OC OA u B Darrow_forward
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