Organic Chemistry Exam 2 Test Answers – Flashcards
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Which of these is the rate-determining step in the nitration of benzene?
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Addition of the nitronium to benzene to produce the arenium ion.
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In electrophilic aromatic substitution, the attacking species (electrophile) necessarily is a
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lewis acid
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the electrophilic bromination or chlorination of benzene requires, in addition to the halogen :
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a lewis acid
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Which of these liquids would be unsuitable as an inert solvent for a friedel-crafts reaction ?
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chlorobenzene
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Undesired Polysubstitution of an aromatic nucleus is most likely to be encountered in the case of ?
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friedel-crafts alkylation
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this molecule does not normally participate as a reactant in friedel-crafts reaction ?
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nitrobenzene
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which one of these molecules can be a reactant in a Friedel-Crafts reaction?
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Bromobenzene
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a mixture of chlorobenzene (1m0l) and acetanilide (1mol) is allowed to react with bra (0.5), what is the principle product of the competing reactions ?
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4-Bromoacetanilide
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what might be predicted to happen when the following substances undergoes friedel-crafts acylation ?
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substitution occurs in Ring B, p-to the methylene group.
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Which of the following is not a meta-directing substituent when present on the benzene ring ?
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-NHCOCH3
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which of the following is not an ortho-para director in electrophilic aromatic substation ?
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-CF3
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what is the best prediction of the site of substitution when 3 methyl phenol is nitrated ?
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c-4 and c-6
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trifluoromethyl benzene, C6H5CF3 will
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nitrate slowly in the meta position
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which of these compounds give essential a single product on electrophilic substitution of a third group ?
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m-xylene
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which of the following compounds would you expect to be most reactive toward ring nitration ?
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m-xylene
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what is a feature found in all ortho-para directing groups ?
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the group has the ability to delocalize the positive charge of the arenium ion.
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what feature is common to all meta directing groups ?
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the atom directly attached to the ring has a full or well developed partial positive charge.
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This substituent deactivates the benzene ring towards electrophilic substitution but directs the incoming group chiefly to the ortho and para positions.
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-F
