Benzene

State the type of mechanism for the reaction:

• Nucleophilic Addition

• Electrophilic Addition

• Nucleophilic Substitution

• Electrophilic Aromatic Substitution

Choose the method for the preparation of benzoic acid from ethyl benzene.

• Heated with concentrated HNO₃

• Heated with alkaline KMnO₄ followed by acidification

• Addition of Cl₂ in the presence of sunlight followed by the addition of NaOH in CH₃CH₂OH

• Addition of Cl₂ in the presence of sunlight followed by boiling with aqueous NaOH

Indicate the correct names for the following amines. Notice that for some of them, two names are applicable: an IUPAC name and a common name

• 1-methyl-3-bromoaniline

• N-methyl-3-bromoaniline

• 1-aminomethyl-3-bromobenzene

• 3-bromo-N-methylaniline

Which reagent would be used for the nitration of benzene?

I. mixture of concentrated nitric and sulphuric acids

HNO₃/H₂SO₄

II. sodium nitrate(V) NaNO₃

III. sodium nitrate(III) NaNO₂

• I only

• I and II only

• II and III only

• I, II and III

Which of the following compound is aromatic haloalkane?

I. C₆H₅Cl

II. C₆H₅CH₂Cl

III. CH₃CH₂Cl

• I only

• I and II only

• II and III only

• I, II and III

The following reaction is known as

• Friedel-Crafts acylation

• Hoffman’s Degradation

• Coupling reaction

• Friedel-Crafts alkylation

The product formed when an ethylbenzene is refluxed with acidic potassium (VII) manganate is

• C₆H₅CHO

• C₆H₅COOH

• C₆H₅CH₂OH

• C₆H₅CH₂COOH

What are the best structures for U and V in the following reaction:

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Choose the correct statement

• Carbon to carbon bond in benzene have the same bond length

• Cyclobutene has delocalised electrons

• C=C bond in cyclobutene is longer than C-C bond in butane

• All atoms in cyclobutene, pentane and benzene are planar

Which compound below is aromatic?

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