(d)There are only three tetrafuorobenzenes. The two hydrogens may be ortho, meta, or para toeach other.(e)There are only two naphthalenecarboxylic acids.(f)There are three isomeric bromoanthracenes. All other positions are equivalent to one ofthese.11.26There are three isomeric trimethylbenzenes:Their relative stabilities are determined by steric effects. Mesitylene (the 1,3,5-trisubstituted iso-mer) is the most stable because none of its methyl groups are ortho to any other methyl group.Ortho substituents on a benzene ring, depending on their size, experience van der Waals strain in thesame way that cis substituents on a carbon–carbon double bond do. Because the carbon–carbonbond length in benzene is somewhat longer than in an alkene, these effects are smaller in magni-tude, however. The 1,2,4-substitution pattern has one methyl
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This note was uploaded on 09/26/2011 for the course CHM 2210 taught by Professor Reynolds during the Fall '01 term at University of Florida.