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WorksheetsBenzene Concepts
Total questions: 10
Worksheet time: 5mins
Which of these is an activating group?
NH2
NO2
COCH3
SO3H
Which is deactivating group?
OH
CHO
CH3
OCH3
Which of the following act as catalysis in the nitration of benzene?
Conc. HCl
Dil. HCl
Conc. H2SO4
Dil. H2SO4
What is electrophilic substitution?
A substitution reaction in which an electrophile is substituted for the electrons in the benzene ring
A substitution reaction in which the benzene ring is attacked by a lone pair of electrons from an electrophile
A substitution reaction in which an electrophile is attacked by the electrons in the benzene ring
Which is least reactive in aromatic electrophilic substitution?
Ethyl Benzene
Anisole
Acetophenone
Chlorobenzene
With respect to the electrophilic aromatic substitution of benzene which of the following is not true?
A non-aromatic intermediate is formed
Benzene acts as an electrophile
A proton is lost in the final step
Resonance forms are important
What is acylation?
Substitution of one of the hydrogen atoms of a benzene ring by an acyl group from an acyl chloride
Addition to the benzene ring of an alkyl group from a halogenoalkane
Addition to the benzene ring of an acyl group from an acyl chloride
What is a Friedel-Crafts reaction?
An electrophilic substitution reaction
A reaction to form a C-C bond to an aromatic ring
A reaction involving a Lewis acid
Which of the following statements regarding electrophilic aromatic substitution is wrong?
Acetyl and cyano substituents are both deactivating and m-directing.
Alkyl groups are activating and o,p-directing.
Ammonium groups are m-directing but amino groups are and o,p-directing.
Chloro and methoxy substituents are both deactivating and o,p-directing.
What is the electrophile in the acylation of benzene?
AlCl3
CO+
Cl+
R-CO+
