Explanation:
In Friedel-Crafts acylation, an electrophilic acyl species replaces a hydrogen atom on an aromatic ring, so it is an electrophilic aromatic substitution reaction.
4. What is the usual organic product formed when an aromatic ring undergoes Friedel-Crafts acylation?
A.
An aromatic ketone
B.
An aromatic alcohol
C.
An aromatic amine
D.
An aromatic alkene
Correct Answer:
An aromatic ketone
Explanation:
Friedel-Crafts acylation attaches an acyl group to the aromatic ring, generally producing an aromatic ketone.
5. Which general change represents Friedel-Crafts acylation of an aromatic ring?
A.
Aromatic ring plus acyl group gives an acyl-substituted aromatic compound
B.
Aromatic ring plus alkyl group gives an acyl-substituted aromatic compound
C.
Aromatic ring plus hydroxyl group gives an alkane
D.
Aromatic ring plus hydrogen gives an aromatic ketone
Correct Answer:
Aromatic ring plus acyl group gives an acyl-substituted aromatic compound
Explanation:
The reaction is defined by adding an acyl group to an aromatic ring, forming an acyl-substituted aromatic compound.
6. In the name Friedel-Crafts acylation, the word "acylation" refers to the introduction of which group?
A.
Acyl group
B.
Alkyl group
C.
Halogen group
D.
Nitro group
Correct Answer:
Acyl group
Explanation:
Acylation means the introduction of an acyl group into a molecule, and in this reaction the group is introduced into an aromatic ring.
7. Which compound is characteristically prepared by Friedel-Crafts acylation?
A.
Aryl ketone
B.
Aryl amine
C.
Aryl alcohol
D.
Aryl alkene
Correct Answer:
Aryl ketone
Explanation:
Friedel-Crafts acylation places an acyl group on an aromatic ring, giving an aryl ketone as the characteristic product.
8. What happens to the aromatic ring during Friedel-Crafts acylation?
A.
One hydrogen is replaced by an acyl group
B.
One hydrogen is replaced by an alkyl group
C.
The ring is completely hydrogenated
D.
The ring is converted into a nonaromatic chain
Correct Answer:
One hydrogen is replaced by an acyl group
Explanation:
Friedel-Crafts acylation is a substitution reaction in which an acyl group replaces a hydrogen atom on the aromatic ring.
9. Which statement correctly defines Friedel-Crafts acylation?
A.
It is the acylation of an aromatic compound by electrophilic substitution
B.
It is the alkylation of an aromatic compound by nucleophilic substitution
C.
It is the oxidation of an aromatic compound to an alcohol
D.
It is the reduction of an aromatic compound to an alkane
Correct Answer:
It is the acylation of an aromatic compound by electrophilic substitution
Explanation:
The reaction introduces an acyl group into an aromatic compound through electrophilic aromatic substitution.
10. Friedel-Crafts acylation differs from Friedel-Crafts alkylation because it introduces a(n) ____ group.
A.
Acyl
B.
Alkyl
C.
Hydroxyl
D.
Amino
Correct Answer:
Acyl
Explanation:
The defining difference is that Friedel-Crafts acylation introduces an acyl group, whereas Friedel-Crafts alkylation introduces an alkyl group.
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Definition of Friedel-Crafts Acylation
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