Organic Chemistry
8th Edition
ISBN: 9781337516402
Author: Brown
Publisher: Cengage
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Textbook Question
Chapter 2, Problem 2.35P
Consider 1-bromo-2-methylpropane and draw the following.
- (a) The staggered conformation(s) of lowest energy
- (b) The staggered conformation(s) of highest energy
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(B) Draw two chair conformations of the following substituted cyclohexane and identify the
most stable conformation. Clearly show the axial and equatorial bonds.
(a) which if the structure of trans-1,2-dimethylcyclopentane?
(b) which is the most stable conformation of 1-bromo-2-ethylcyclohexane?
(c) which is the least stable conformation of 1-bromo-2-ethylcyclohexane?
(d) which is the more stable configuration of 1,3-dimethylcyclopentane?
*Et = ethyl
Take 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?
Chapter 2 Solutions
Organic Chemistry
Ch. 2.2 - Do the line-angle formulas in each pair represent...Ch. 2.2 - Draw line-angle formulas for the three...Ch. 2.3 - Write IUPAC names for these alkanes.Ch. 2.4 - Combine the proper prefix, infix, and suffix and...Ch. 2.4 - Write the molecular formula, IUPAC name, and...Ch. 2.4 - Write molecular formulas for each bicycloalkane,...Ch. 2.4 - Prob. 2.7PCh. 2.5 - For 1,2-dichloroethane: (a) Draw Newman...Ch. 2.5 - Following is a chair conformation of cyclohexane...Ch. 2.5 - Draw the alternative chair conformation for the...
Ch. 2.5 - Draw a chair conformation of...Ch. 2.6 - Which cycloalkanes show cis, trans isomerism? For...Ch. 2.6 - Following is a planar hexagon representation for...Ch. 2.6 - Here is one cis,trans isomer of...Ch. 2.6 - Prob. AQCh. 2.6 - Prob. BQCh. 2.6 - Prob. CQCh. 2.7 - Arrange the alkanes in each set in order of...Ch. 2 - Write a line-angle formula for each condensed...Ch. 2 - Write the molecular formula of each alkane.Ch. 2 - Using parentheses and subscripts, provide an even...Ch. 2 - Which statements are true about constitutional...Ch. 2 - Prob. 2.20PCh. 2 - Each member of the following set of compounds is...Ch. 2 - Each of the following compounds is an amine...Ch. 2 - Each of the following compounds is either an...Ch. 2 - Draw structural formulas and write IUPAC names for...Ch. 2 - Draw structural formulas for all of the following....Ch. 2 - Write IUPAC names for these alkanes and...Ch. 2 - Write structural formulas and line-angle formulas...Ch. 2 - Explain why each is an incorrect IUPAC name and...Ch. 2 - For each IUPAC name, draw the corresponding...Ch. 2 - Write the IUPAC name for each compound.Ch. 2 - Prob. 2.31PCh. 2 - Torsional strain resulting from eclipsed CH bonds...Ch. 2 - How many different staggered conformations are...Ch. 2 - Consider 1-bromopropane, CH3CH2CH2Br. (a) Draw a...Ch. 2 - Consider 1-bromo-2-methylpropane and draw the...Ch. 2 - trans-1,4-Di-tert-butylcyclohexane exists in a...Ch. 2 - From studies of the dipole moment of...Ch. 2 - Prob. 2.38PCh. 2 - Following are the alternative chair conformations...Ch. 2 - Prob. 2.40PCh. 2 - Prob. 2.41PCh. 2 - Draw line-angle formulas for the cis and trans...Ch. 2 - Name and draw structural formulas for all...Ch. 2 - Using a planar pentagon representation for the...Ch. 2 - Gibbs free energy differences between...Ch. 2 - Prob. 2.46PCh. 2 - Calculate the difference in Gibbs free energy in...Ch. 2 - Draw the alternative chair conformations for the...Ch. 2 - Use your answers from Problem 2.48 to complete the...Ch. 2 - There are four cis,trans isomers of...Ch. 2 - Draw alternative chair conformations for each...Ch. 2 - 1,2,3,4,5,6-Hexachlorocyclohexane shows cis,trans...Ch. 2 - Prob. 2.53PCh. 2 - What generalization can you make about the...Ch. 2 - What unbranched alkane has about the same boiling...Ch. 2 - Complete and balance the following combustion...Ch. 2 - Following are heats of combustion per mole for...Ch. 2 - Following are structural formulas and heats of...Ch. 2 - Without consulting tables, arrange these compounds...Ch. 2 - Which would you predict to have the larger (more...Ch. 2 - Following are structural formulas for 1,4-dioxane...Ch. 2 - Following is a planar hexagon representation of...Ch. 2 - On the left is a stereorepresentation of glucose...Ch. 2 - Prob. 2.64PCh. 2 - Prob. 2.65P
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- Draw the most stable conformation of (a) ethylcyclohexanearrow_forwardConsider 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_forwardConsider 1-bromopropane, CH3CH2CH2Br. (a) Which of these is the lowest energy conformation?arrow_forward
- Consider 1-bromo-2-methylpropane and draw the following. Q) The staggered conformation(s) of highest energyarrow_forwardDraw the alternative chair conformations for the cis and trans isomers of 1,2-dimethylcyclohexane, 1,3- dimethylcyclohexane, and 1,4-dimethylcyclohexane. (a ) Indicate by a label whether each methyl group is axial or equatorial. (b) For which isomer(s) are the alternative chair conformations of equal stability? (c) For which isomer(s) is one chair conformation more stable than the other?arrow_forwardConsider 1-bromo-2-methylpropane and draw the following. Q) The staggered conformation(s) of lowest energyarrow_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 the most stable conformation of(a) trans-1-tert-butyl-2-methylcyclohexane.arrow_forwardDraw the most stable chair conformation of each of the following compounds. (a) cis-1,1,4- trimethylcyclohexane (B) trans -1,1,3-trimethylcyclohexane (c) cis -1 fluro-4-ethylcyclohexane -arrow_forward
- Among the figure, (a) what is the most stable conformation of n-pentane? (b) gauche conformation of butane and (c) least stable conformation of butanearrow_forwardFollowing are the alternative chair conformations for trans-1,2-dimethylcyclohexane.(a) Estimate the difference in free energy between these two conformations.(b) Given your value in (a), calculate the percent of each chair present in anequilibrium mixture of the two at 25°C.arrow_forwardDraw the most stable conformation of (a) cis-1-tert-butyl-3-ethylcyclohexane.arrow_forward
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