Which of the statements about gasoline are true? Diesel fuel has a greater proportion of straight-chain alkanes, such as octane, than gasoline. Oxygenates increase the octane rating by increasing the amount of oxygen present, thus allowing automobiles to travel longer distances on less fuel. Petroleum is a mixture of several different hydrocarbon compounds including naphthalenes and aromatics. 55 Methyl tert-butyl ether (MTBE) is a non-hazardous substance that is often added to gasoline to increase the octane rating.

Which of the statements about gasoline are true? Diesel fuel has a greater proportion of straight-chain alkanes, such as octane, than gasoline. Oxygenates increase the octane rating by increasing the amount of oxygen present, thus allowing automobiles to travel longer distances on less fuel. Petroleum is a mixture of several different hydrocarbon compounds including naphthalenes and aromatics. 55 Methyl tert-butyl ether (MTBE) is a non-hazardous substance that is often added to gasoline to increase the octane rating.

World of Chemistry, 3rd edition

3rd Edition

ISBN:9781133109655

Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Chapter20: Organic Chemistry

Section: Chapter Questions

Problem 38A

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Distinguish between isomerism and resonance. Distinguish between structural and geometric isomerism. When writing the various structural isomers, the most difficult task is identifying which are different isomers and which are identical to a previously written structurethat is, which are compounds that differ only by the rotation of a carbon single bond. How do you distinguish between structural isomers and those that are identical? Alkenes and cycloalkanes are structural isomers of each other. Give an example of each using C4H8. Another common feature of alkenes and cycloalkanes is that both have restricted rotation about one or more bonds in the compound, so both can exhibit cis- trans isomerism. What is required for an alkene or cycloalkane to exhibit cis-trans isomerism? Explain the difference between cis and trans isomers. Alcohols and ethers are structural isomers of each other, as are aldehydes and ketones. Give an example of each to illustrate. Which functional group in Table 21-4 can be structural isomers of carboxylic acids? What is optical isomerism? What do you look for to determine whether an organic compound exhibits optical isomerism? 1-Bromo-1-chloroethane is optically active whereas 1-bromo-2-chloroethane is not optically active. Explain.
What is a hydrocarbon? What is the difference between a saturated hydrocarbon and an unsaturated hydrocarbon? Distinguish between normal and branched hydrocarbons. What is an alkane? What is a cyclic alkane? What are the two general formulas for alkanes? What is the hybridization of carbon atoms in alkanes? What are the bond angles in alkanes? Why are cyclopropane and cyclobutane so reactive? The normal (unbranched) hydrocarbons are often referred to as straight-chain hydrocarbons. What does this name refer to? Does it mean that the carbon atoms in a straight-chain hydrocarbon really have a linear arrangement? Explain. In the shorthand notation for cyclic alkanes, the hydrogens are usually omitted. How do you determine the number of hydrogens bonded to each carbon in a ring structure?
Consider a sample of a hydrocarbon at 0.959 atm and 298 K. Upon combusting the entire sample in oxygen, you collect a mixture of gaseous carbon dioxide and water vapor at 1.51 atm and 375 K. This mixture has a density of 1.391 g/L and occupies a volume four times as large as that of the pure hydrocarbon. Determine the molecular formula of the hydrocarbon and name it.
Summarize the nomenclature rules for alkanes, alkenes, alkynes, and aromatic compounds. Correct the following false statements regarding nomenclature of hydrocarbons. a. The root name for a hydrocarbon is based on the shortest continuous chain of carbon atoms. b. The suffix used to name all hydrocarbons is -ane. c. Substituent groups are numbered so as to give the largest numbers possible. d. No number is required to indicate the positions of double or triple bonds in alkenes and alkynes. e. Substituent groups get the lowest number possible in alkenes and alkynes. f. The ortho- term in aromatic hydrocarbons indicates the presence of two substituent groups bonded to carbon- 1 and carbon-3 in benzene.
Why are different conformations of an alkane not considered structural isomers?
. With very reactive agents, such as the halogen elements, alkanes undergo reactions, whereby a new atom rep laces one or more hydrogen atoms of the alkane.
How does the structure of a cycloalkane differ from that of a straight-chain or branched-chain alkane?
Instead of using the ending “ol,” an OH can be treated like a substituent or halogen using the term“hydroxyl.” For example, hexane-2,4-diol can be called 2,4-dihydroxyhexane. Write anequivalent name for 1,2,3-cyclohexanetriol using the term “hydroxyl.”