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chemistry
organic chemistry

Questions and Answers of Organic Chemistry

Given the following partial structure, add a substituent X to C-1 so that it satisfies the indicated stereo chemical requirement. You may find it helpful to build a molecular model for
The following questions relate to a cyclohexane ring depicted in the chair conformation shown. (a) Is a methyl group at C-6 that is “down” axial or equatorial? (b) Is a methyl group that is
Draw or construct a molecular model of the most stable conformation of 1-tert-butyl-1-methylcyclohexane.
The heats of combustion of ethylcyclopropane and methylcyclobutane have been measured as 3352 and 3384 kJ/mol (801.2 and 808.8 kcal/mol), respectively. Assign the correct heat of combustion to each
Exclusive of compounds with double bonds, four hydrocarbons are constitutional isomers of cis- and trans-1, 2-dimethylcyclopropane. Identify these compounds.
Based on what you know about disubstituted cyclohexanes, which of the following two stereoisomeric 1, 3, 5-trimethylcyclohexanes would you expect to be more stable?
Write structural formulas or make molecular models for the most stable conformation of each of the following compounds: (a) trans-1-tert-Butyl-3-methylcyclohexane (b)
Which of the following compounds are isomers of spiropentane?
Use the bond-cleavage criterion to verify that bicyclobutane and camphene are bicyclic.
Write structural formulas for each of the following bicyclic hydrocarbons: (a) Bicyclo [2.2.1] heptane (c) Bicyclo [3.1.1] heptane (b) Bicyclo [5.2.0] nonane (d) Bicyclo [3.3.0] octane
Draw or build a molecular model of what you would expect to be the most stable conformation of the piperidine derivative in which the hydrogen bonded to nitrogen has been replaced by methyl.
Like hydrogen peroxide, the inorganic substances hydrazine (H2NNH2) and hydroxylamine (H2NOH) possess conformational mobility. Write structural representations or build molecular models of two
Of the three conformations of propane shown, which one is the most stable? Which one is the least stable? Why?
Sight down the C-2─C-3 bond, and draw Newman projection formulas for the (a) Most stable conformation of 2, 2-dimethylbutane (b) Two most stable conformations of 2-methylbutane (c) Two most
One of the staggered conformations of 2-methylbutane in Problem 3.17b is more stable than the other. Which one is more stable? Why?
(a) Write Newman projections for the gauche and anti conformations of 1, 2-dichloroethane (ClCH2CH2Cl). (b) The measured dipole moment of ClCH2CH2Cl is 1.12 D. Which one of the following statements
Sketch an approximate potential energy diagram similar to that shown in Figures 3.4 and 3.7 for rotation about the carbon–carbon bond in 2,2-dimethylpropane. Does the form of the potential energy
Repeat Problem 3.19 for the case of 2-methylbutane.
One of the C─C─C angles of 2, 2, 4, 4-tetramethylpentane is very much larger than the others. Which angle? Why?
Even though the methyl group occupies an equatorial site, the conformation shown is not the most stable one for methylcyclohexane. Explain.
Which of the structures shown for the axial conformation of methylcyclohexane do you think is more stable, A or B? Why?
Which do you expect to be the more stable conformation of cis-1,3-dimethylcyclobutane, A or B? Why?
Determine whether the two structures in each of the following pairs represent constitutional isomers, different conformations of the same compound, or stereoisomers that cannot be interconverted by
Excluding compounds that contain methyl or ethyl groups, write structural formulas for all the bicyclic isomers of (a) C5H8 and (b) C6H10.
In each of the following groups of compounds, identify the one with the largest heat of combustion and the one with the smallest. In which cases can a comparison of heats of combustion be used to
Write a structural formula for the most stable conformation of each of the following compounds: (a) 2, 2, 5, 5-Tetramethylhexane (Newman projection of conformation about C-3—C-4 bond) (b) 2, 2,
Identify the more stable stereoisomer in each of the following pairs, and give the reason for your choice: (a) cis- or trans-1-Isopropyl-2-methylcyclohexane (b) cis- or
One stereoisomer of 1, 1, 3, 5-tetramethylcyclohexane is 15 kJ/mol (3.7 kcal/mol) less stable than the other. Indicate which isomer is the less stable, and identify the reason for its decreased
One of the following two stereoisomers is 20 kJ/mol (4.9 kcal/mol) less stable than the other. Indicate which isomer is the less stable, and identify the reason for its decreased stability.
Cubane (C8H8) is the common name of a polycyclic hydrocarbon that was first synthesized in the early 1960s. As its name implies, its structure is that of a cube. How many rings are present in Cubane?
The following are representations of two forms of glucose. The six-membered ring is known to exist in a chair conformation in each form. Draw clear representations of the most stable conformation of
A typical steroid skeleton is shown along with the numbering scheme used for this class of compounds. Specify in each case whether the designated substituent is axial or equatorial.
Repeat Problem 3.34 for the stereoisomeric steroid skeleton having a cis ring fusion between the first two rings.
Write structural formulas, and give the functional class and substitutive names of all the isomeric alkyl chlorides that have the molecular formula C4H9Cl.
Write structural formulas, and give the functional class and substitutive names of all the isomeric alcohols that have the molecular formula C4H10O.
Classify the isomeric C4H10O alcohols as being primary, secondary, or tertiary.
Bromine is less electronegative than chlorine, yet methyl bromide and methyl chloride have very similar dipole moments. Why?
The constitutional isomer of ethanol, dimethyl ether (CH3OCH3), is a gas at room temperature. Suggest an explanation for this observation.
Write an equation for the reaction of ammonia (NH3) with hydrogen chloride (HCl). Use curved arrows to track electron movement, and identify the acid, base, conjugate acid, and conjugate base.
Hydrogen cyanide (HCN) has a pKa of 9.1. What is its Ka? Is HCN a strong or a weak acid?
As noted in Problem 4.7, hydrogen cyanide (HCN) has a pKa of 9.1. Is cyanide ion (CN─) a stronger base or a weaker base than hydroxide ion (HO─)?
Write an equation for proton transfer from hydrogen chloride to tert-butyl alcohol. Use curved arrows to track electron movement, and identify the acid, base, conjugate acid, and conjugate base.
Is the equilibrium constant for proton transfer from hydrogen chloride to tert-butyl alcohol greater than 1 or less than 1?
Represent the structure of the transition state for proton transfer from hydrogen chloride to tert-butyl alcohol.
Write chemical equations for the reaction that takes place between each of the following pairs of reactants: (a) 2-Butanol and hydrogen bromide (b) 3-Ethyl-3-pentanol and hydrogen chloride (c)
Of the isomeric C5H11+ carbocations, which one is the most stable?
1-Butanol and 2-butanol are converted to their corresponding bromides on being heated with hydrogen bromide. Write a suitable mechanism for each reaction, and assign each the appropriate symbol (SN1
Write a structural formula for the most stable of the free radicals that have the formula C5H11.
Carbon–carbon bond dissociation energies have been measured for alkanes. Without referring to Table 4.3, identify the alkane in each of the following pairs that has the lower carbon–carbon bond
Write equations for the initiation and propagation steps for the formation of dichloromethane by free-radical chlorination of chloromethane
Chlorination of ethane yields, in addition to ethyl chloride, a mixture of two isomeric dichlorides. What are the structures of these two dichlorides?
Assuming the relative rate of secondary to primary hydrogen atom abstraction to be the same in the chlorination of propane as it is in that of butane, calculate the relative amounts of propyl
Give the structure of the principal organic product formed by free-radical bromination of each of the following: (a) Methylcyclopentane (c) 2, 2, 4-Trimethylpentane (b)
Write structural formulas for each of the following alcohols and alkyl halides: (a) Cyclobutanol (e) 2,6-Dichloro-4-methyl-4-octanol (b) sec-Butyl alcohol (f)
Name each of the following compounds according to substitutive IUPAC nomenclature: (a) (CH3)2CHCH2CH2CH2Br (b) (CH3)2CHCH2CH2CH2OH (c) Cl3CCH2Br (d) Cl2CHCHB (e) CF3CH2OH
Write structural formulas, or build molecular models for all the constitutionally isomeric alcohols of molecular formula C5H12O. Assign a substitutive and a functional class name to each one, and
A hydroxyl group is a somewhat “smaller” substituent on a six-membered ring than is a methyl group. That is, the preference of a hydroxyl group for the equatorial orientation is less pronounced
By assuming that the heat of combustion of the cis isomer was larger than the trans, structural assignments were made many years ago for the stereoisomeric 2-, 3-, and 4-methylcyclohexanols. This
(a) Menthol, used to flavor various foods and tobacco, is the most stable stereoisomer of 2-isopropyl-5-methylcyclohexanol. Draw or make a molecular model of its most stable conformation. Is the
Each of the following pairs of compounds undergoes a Bronsted acid–base reaction for which the equilibrium lies to the right. Give the products of each reaction, and identify the acid, the base,
Transition-state representations are shown for two acid–base reactions. For each one, write the equation for the reaction it represents in the direction for which the equilibrium lies to the right.
Calculate Ka for each of the following acids, given its pKa. Rank the compounds in order of decreasing acidity. (a) Aspirin: pKa = 3.48 (b) Vitamin C (ascorbic acid): pKa = 4.17 (c) Formic acid
The pKa’s of methanol (CH3OH) and methanethiol (CH3SH) are 16 and 11, respectively. Which is more basic, KOCH3 or KSCH3?
Write a chemical equation for the reaction of 1-butanol with each of the following: (a) Sodium amide (NaNH2) (d) Phosphorus tribromide (b) Hydrogen bromide, heat (e) Thionyl chloride (c) Sodium
4.32 Each of the following reactions has been described in the chemical literature and involves an organic starting material somewhat more complex than those we have encountered so far. Nevertheless,
Select the compound in each of the following pairs that will be converted to the corresponding alkyl bromide more rapidly on being treated with hydrogen bromide. Explain the reason for your
Assuming that the rate-determining step in the reaction of cyclohexanol with hydrogen bromide to give cyclohexyl bromide is unimolecular, write an equation for this step. Use curved arrows to show
Assuming that the rate-determining step in the reaction of 1-hexanol with hydrogen bromide to give 1-bromohexane is an attack by a nucleophile on an alkyloxonium ion; write an equation for this step.
Two stereoisomers of 1-bromo-4-methylcyclohexane are formed when trans-4-methylcyclohexanol reacts with hydrogen bromide. Write structural formulas or make molecular models of: (a)
Basing your answers on the bond dissociation energies in Table 4.3, calculate which of the following reactions are endothermic and which are exothermic: (a) (CH3)2CHOH + HF → (CH3)2CHF +
By carrying out the reaction at -78°C it is possible to fluorinate 2, 2-dimethylpropane to yield (CF3)4C. Write a balanced chemical equation for this reaction.
In a search for fluorocarbons having anesthetic properties, 1, 2-dichloro-1, 1-difluoropropane was subjected to photochemical chlorination. Two isomeric products were obtained, one of which was
Among the isomeric alkanes of molecular formula C5H12, identify the one that on photochemical chlorination yields (a) A single monochloride (c) Four isomeric monochlorides (b) Three isomeric
In both the following exercises, assume that all the methylene groups in the alkane are equally reactive as sites of free-radical chlorination. (a) Photochemical chlorination of heptane gave a
Photochemical chlorination of 2,2,4-trimethylpentane gives four isomeric monochlorides. (a) Write structural formulas for these four isomers. (b) The two primary chlorides make up 65% of the
Photochemical chlorination of pentane gave a mixture of three isomeric monochlorides. The principal monochloride constituted 46% of the total, and the remaining 54% was approximately a 1:1 mixture of
Cyclopropyl chloride has been prepared by the free-radical chlorination of cyclopropane. Write a stepwise mechanism for this reaction.
Name each of the following using IUPAC nomenclature: (a) (CH3)2CoeC (CH3)2 (d) CH2 = CHCH2 CHCH3 (b) (CH3)3CCHoeCH2 (e) CH2 = CHCH2CHCH3 (c) (CH3)2CoeCHCH2CH2CH3
Write structural formulas or build molecular models and give the IUPAC names of all the monochloro-substituted derivatives of cyclopentene
We can use bond-line formulas to represent alkenes in much the same way that we use them to represent alkanes. Consider the following alkene: (a) What is the molecular formula of this
How many alkenes have the molecular formula C5H10? Write their structures and give their IUPAC names. Specify the configuration of stereoisomers as cis or trans as appropriate.
Female houseflies attract males by sending a chemical signal known as a pheromone. The substance emitted by the female housefly that attracts the male has been identified as cis-9-tricosene, C23H46.
Determine the configuration of each of the following alkenes as Z or E as appropriate:
Write structural formulas or build molecular models and give the IUPAC names for all the alkenes of molecular formula C6H12 that contain a trisubstituted double bond. (Don’t forget to include
Give the structure or make a molecular model of the most stable C6H12 alkene.
Arrange the following alkenes in order of decreasing stability: 1-pentene; (E)-2-pentene; (Z)-2-pentene; 2-methyl-2-butene.
Despite numerous attempts, the alkene 3,4-di-tert-butyl-2,2,5,5-tetramethyl-3-hexene has never been synthesized. Can you explain why? Try making a space-filling model of this compound.
Place a double bond in the carbon skeleton shown so as to represent (a) (Z)-1-Methylcyclodecene (d) (E)-3-Methylcyclodecene (b) (E)-1-Methylcyclodecene (e) (Z)-5-Methylcyclodecene (c)
Identify the alkene obtained on dehydration of each of the following alcohols: (a) 3-Ethyl-3-pentanol (c) 2-Propanol (b) 1-Propanol (d) 2,3,3-Trimethyl-2-butanol
Each of the following alcohols has been subjected to acidcatalyzed dehydration and yields a mixture of two isomeric alkenes. Identify the two alkenes in each case, and predict which one is the major
What three alkenes are formed in the acid-catalyzed dehydration of 2-pentanol?
Write a structural formula for the carbocation intermediate formed in the dehydration of each of the alcohols in Problem 5.13 (Section 5.10). Using curved arrows, show how each carbocation is
The alkene mixture obtained on dehydration of 2,2-dimethylcyclohexanol contains appreciable amounts of 1,2-dimethylcyclohexene. Give a mechanistic explanation for the formation of this product.
Write the structures of all the alkenes that can be formed by dehydrohalogenation of each of the following alkyl halides. Apply the Zaitsev rule to predict the alkene formed in greatest amount in
Write structural formulas for all the alkenes that can be formed in the reaction of 2-bromobutane with potassium ethoxide.
Use curved arrows to track electron movement in the dehydrohalogenation of tert-butyl chloride by sodium methoxide by the E2 mechanism.
Use curved arrow notation to show the bonding changes in the reaction of cis-4-tert-butylcyclohexyl bromide with potassium tert-butoxide. Be sure your drawing correctly represents the spatial
Write structural formulas for each of the following: (a) 1-Heptene (g) 1-Bromo-3-methylcyclohexene (b) 3-Ethyl-2-pentene (h) 1-Bromo-6-methylcyclohexene (c) cis-3-Octene (i)
Write a structural formula or build a molecular model and give a correct IUPAC name for each alkene of molecular formula C7H14 that has a tetrasubstituted double bond.
Give the IUPAC names for each of the following compounds: (a) (CH3CH2)2C = CHCH3 (b) (CH3CH2)2C = C (CH2CH3)2 (c) (CH3)3CCH = CCl2

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