LL ORG CHEM
6th Edition
ISBN: 9781264840083
Author: SMITH
Publisher: MCG
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Textbook Question
Chapter 4, Problem 52P
(a) Draw the anti and gauche conformations for ethylene glycol
is unusual in that the gauche conformation is more stable than the anti conformation. Offer an explanation.
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The melting points and boiling points of two isomeric alkanes are as follows: CH3(CH2)6CH3, mp = -57 °C and bp = 126 °C; (CH3)3CC(CH3)3, mp = 102 °C and bp = 106 °C. (a) Explain why one isomer has a lower melting point but higher boiling point. (b) Explain why there is a small difference in the boiling points of the two compounds, but a huge difference in their melting points.
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Chapter 4 Solutions
LL ORG CHEM
Ch. 4.1 - Prob. 1PCh. 4.1 - Problem 4.2 Which of the following is not another...Ch. 4.1 - Problem 4.3 Draw the five constitutional isomers...Ch. 4.1 - Prob. 4PCh. 4.1 - Prob. 5PCh. 4.2 - Draw the five constitutional isomers that have...Ch. 4.4 - Problem 4.7 Give the IUPAC name for each...Ch. 4.4 - Give the IUPAC name for each compound. a....Ch. 4.4 - Problem 4.9 Give the structure corresponding to...Ch. 4.4 - Prob. 10P
Ch. 4.5 - Give the IUPAC name for each compound.Ch. 4.5 - Give the structure corresponding to each IUPAC...Ch. 4.8 - Arrange the following compounds in order of...Ch. 4.9 - Problem 4.14 Draw the staggered and eclipsed...Ch. 4.9 - Prob. 15PCh. 4.9 - Prob. 16PCh. 4.10 - Problem 4.17 a. Draw the three staggered and...Ch. 4.10 - Problem 4.18 Rank the following conformations in...Ch. 4.10 - Problem 4.19 Consider rotation around the...Ch. 4.10 - Calculate the destabilization present in each...Ch. 4.12 - Problem 4.21 Classify the ring carbons as up or...Ch. 4.12 - Problem 4.22 Using the cyclohexane with the C’s...Ch. 4.13 - Draw a second chair conformation for each...Ch. 4.13 - Problem 4.24 Draw both conformations for and...Ch. 4.13 - Problem 4.25 Draw the structure for each compound...Ch. 4.13 - Prob. 26PCh. 4.14 - Prob. 31PCh. 4.14 - Prob. 32PCh. 4.15 - Prob. 33PCh. 4 - Name each alkane using the ball-and-stick model,...Ch. 4 -
4.40 Draw the structure corresponding to each...Ch. 4 - 4.42 Give the IUPAC name for each compound.
a....Ch. 4 - Prob. 42PCh. 4 - 4.46 Considering rotation around the bond...Ch. 4 - 4.50 Calculate the barrier to rotation for each...Ch. 4 - 4.51 The eclipsed conformation of is less...Ch. 4 - (a) Draw the anti and gauche conformations for...Ch. 4 - For each compound drawn below: a.Label each OH,Br...Ch. 4 - Draw the two possible chair conformations for...Ch. 4 - For each compound drawn below: a. Draw...Ch. 4 - Classify each pair of compounds as constitutional...Ch. 4 - Prob. 66PCh. 4 - 4.64 Draw the products of combustion of each...Ch. 4 - 4.65 Hydrocarbons like benzene are metabolized in...Ch. 4 - Prob. 69PCh. 4 - Prob. 70PCh. 4 - Cyclopropane and cyclobutane have similar strain...Ch. 4 - Prob. 72PCh. 4 - Haloethanes (CH3CH2X,X=Cl,Br,I) have similar...Ch. 4 - Prob. 74PCh. 4 - Prob. 75PCh. 4 - Consider the tricyclic structure B (a) Label each...Ch. 4 - Read Appendix B on naming branched alkyl...Ch. 4 - Read Appendix B on naming bicyclic compounds. Then...
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- Ethanol (CH3CH2OH) and dimethyl ether (CH3OCH3) are constitutional isomers. (a) Predict which of the two has the higher boiling point. (b) Predict which of the two is more soluble in water.arrow_forwardDraw the anti and gauche conformations for ethylene glycol (HOCH2CH2OH).arrow_forward4. (a) Draw a skeletal (line-bond) structure for 3,4-dimethylhexane. (b) Draw a sawhorse representation of any staggered conformation of this molecule looking down the carbon-3 to carbon-4 bond. (c) Draw a Newman projection looking down the carbon-3 to carbon-4 bond of the same conformation that you drew as a sawhorse representation.arrow_forward
- Consider 1-bromopropane, CH3CH2CH2Br. (a) Draw a Newman projection for the conformation in which CH3 and -Br are anti (dihedral angle 180°). (b) Draw Newman projections for the conformations in which - CH3 and -Br are gauche (dihedral angles 60° and 300°). (c) Which of these is the lowest energy conformation? (d) Which of these conformations, if any, are related by reflection?arrow_forwardTake a look at the butane conformers below. Identify: (a)Which is an anti conformation in Newman? (b)Which is a Gauche conformation? (c)Which is the more stable Sawhorse conformer? (d)Which has the same potential energy/strain with ALS?arrow_forward(c)Conformational isomer is the different spatial arrangement of the atoms that resulted from rotation about a single bond. (i) Differentiate anti conformers and gauche conformers (ii) Using a newman projection, draw the anti conformer and gauche conformers of 3,3-dimethylheptane (viewed along the C3-C4 bond)arrow_forward
- There are four cis,trans isomers of 2-isopropyl-5-methylcyclohexanol:(a) Using a planar hexagon representation for the cyclohexane ring, draw structural formulas for the four cis,trans isomers.(b) Draw the more stable chair conformation for each of your answers in part (a).(c) Of the four cis,trans isomers, which is most stable? (Hint: If you answered thispart correctly, you picked the isomer found in nature and given the name menthol.)arrow_forwardQUESTION 3 (a) Draw the two conformations of ethane which has an energy minimum and energy maximum using the Newman projection. Explain why one conformation is lower in energy than the other.arrow_forward(d) CH3 CH3 (е) HCI HCI Ether Etherarrow_forward
- (a) Convert each chair cyclohexane to a hexagon with wedges and dashed wedges. (b) Draw a stereoisomer of each compound in its more stable chair conformation.arrow_forwardDraw each compound in its most stable conformation(s). Then draw it in its most symmetric conformation, and determine whether it is chiral.(a) 2-methylbutanearrow_forwardConsider the tricyclic structure B. (a) Label each substituent on the rings as axial or equatorial. (b) Draw B using chair conformations for each sixmembered ring. (c) Label the atoms on the ring fusions (the carbons that join each set of two rings together) as cis or trans to each other.arrow_forward
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