Chapter 11: Problem 47
Draw all the possible structural isomers for the molecule having the formula \(\mathrm{C}_{7} \mathrm{H}_{7} \mathrm{Cl}\). The molecule contains one benzene ring.
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Chapter 11: Problem 47
Draw all the possible structural isomers for the molecule having the formula \(\mathrm{C}_{7} \mathrm{H}_{7} \mathrm{Cl}\). The molecule contains one benzene ring.
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Octane number is assigned to gasoline to indicate the tendency of "knocking" in the automobile's engine. The higher the octane number, the more smoothly the fuel will burn without knocking. Branched-chain aliphatic hydrocarbons have higher octane numbers than straight-chain aliphatic hydrocarbons, and aromatic hydrocarbons have the highest octane numbers. (a) Arrange these compounds in the order of decreasing octane numbers: \(2,2,4-\) trimethylpentane, toluene (methylbenzene), \(n\) -heptane, and 2 -methylhexane. (b) Oil refineries carry out catalytic reforming in which a straight-chain hydrocarbon, in the presence of a catalyst, is converted to an aromatic molecule and a useful by-product. Write an equation for the conversion from \(n\) -heptane to toluene. (c) Until 2000 , tert-butylmethyl ether had been widely used as an antiknocking agent to enhance the octane number of gasoline. Write the structural formula of the compound.
Alkenes exhibit geometric isomerism because rotation about the \(\mathrm{C}=\mathrm{C}\) bond is restricted. Explain.
What is Markovnikov's rule?
How many carbon-carbon sigma bonds are present in each of these molecules? (a) benzene, (b) cyclobutane, (c) 3-ethyl-2-methylpentane.
Why is it that alkanes and alkynes, unlike alkenes, have no geometric isomers?
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