A Level Chemistry 9701 (Chap 25, 26) (Benzene Compounds, Acids)

Organic hydrocarbons containing one or more benzene rings are generally called __________.

• Arenes

• Aryl Compounds

• Aromatic Compounds

• All options are correct

The correct IUPAC (International Union of Pure & Applied Chemistry) name for the given compound is:

• 2,4,6-tribromophenol

• 1,3,6-tribromophenol

• 3,5-dibromo-2-hydroxybromobenzene

• 2-hydroxy-1,3,5-tribromobenzene

The correct name for C₆H₅NH₂ is:

• Phenylamine

• Nitrophenyl

• Nitrobenzene

• Aminobenzene

Answer explanation

Phenylamine

The overlap of p-orbitals produces a ring of delocalised electrons _1_ the plane of benzenes' carbon atoms. Due to which, the three bond angles around each of the _2_ hybridised carbon atoms are _3_. Fill in the blanks appropriately.

• 1. 1. Above and below

  2. 2. sp²

  3. 3. 120°

• 1. 1. Above

  2. 2. sp³

  3. 3. 120°

• 1. 1. Below

  2. 2. sp³

  3. 3. 120°

• 1. 1. Above and below

  2. 2. sp³

  3. 3. 109.5°

Answer explanation

1. 1. Above and below

2. 2. sp²

3. 3. 120°

When we react methylbenzene with chlorine gas (excess) using an anhydrous AlCl₃ catalyst, how many possible products can be made? (Choose all that apply)

• 2-chloromethylbenzene and 4-chloromethylbenzene

• 2,4-dichloromethylbenzene

• 2,6-dichloromethylbenzene

• 2,4,6-trichloromethylbenzene

Answer explanation

All answers are correct answers.

The formation of bromobenzene from benzene with using anhydrous AlBr₃ catalyst is the _1_ reaction in its type while the catalyst in this case is known as _2_. Fill in the blanks appropriately.

• 1 = Electrophilic Substitution Reaction

  2 = Halogen Carrier

• 1 = Nucleophilic Substitution Reaction

  2 = Electron Carrier

• 1 = Addition Elimination Reaction

  2 = Eliminating Nucleophile

• 1 = Electrophilic Substitution Reaction

  2 = Electron Carrier

Answer explanation

1 = Electrophilic Substitution Reaction

2 = Halogen Carrier

1. 1. What are the conditions required to produce chloromethylbenzene?

2. 2. What type of reaction is happening in 1?

• 1. 1. Boil in the presence of UV light/Sunlight

  2. 2. Free Radical Substitution

• 1. 1. Boil in the presence of UV light/Sunlight

  2. 2. Electrophilic Substitution

• 1. 1. Excess Chlorine Gas + Anhydrous AlCl₃

  2. 2. Electrophilic Substitution

• 1. 1. Excess Chlorine Gas + Anhydrous AlCl₃

  2. 2. Nucleophilic Substitution

Answer explanation

1. 1. Boil in the presence of UV light/Sunlight

2. 2. Free Radical Substitution

A student carried out the following two step process to form the following organic product. Choose the right set of conditions for the given steps. (Consider all rings in the diagram to be benzene rings)

• 1. 1. CH₃Cl + Heat + Anhydrous AlCl₃

  2. 2. Excess Cl₂ gas + Boil + UV Light

• 1. 1. CH₃COCl + Heat + Anhydrous AlCl₃

  2. 2. Excess Cl₂ gas + Boil + UV Light

• 1. 1. CH₃COCl + Heat + Anhydrous AlCl₃

  2. 2. Excess Cl₂ gas + Heat + Anhydrous AlCl₃

• 1. 1. CH₃Cl + Heat + Anhydrous AlCl₃

  2. 2. Excess Cl₂ gas + Heat + Anhydrous AlCl₃

Answer explanation

1. 1. CH₃Cl + Heat + Anhydrous AlCl₃

2. 2. Excess Cl₂ gas + Boil + UV Light

A student carried out the following two step process to form the following organic product. Choose the correct types of reactions for each step given. (Consider all rings in the diagram to be benzene rings)

• 1. 1. Friedel Craft Alkylation

  2. 2. Free Radical Substitution

• 1. 1. Friedel Craft Acylation

  2. 2. Free Radical Substitution

• 1. 1. Friedel Craft Alkylation

  2. 2. Electrophilic Substitution

• 1. 1. Friedel Craft Alkylation

  2. 2. Nucleophilic Substitution

Answer explanation

1. 1. Friedel Craft Alkylation

2. 2. Free Radical Substitution

Which of the following reactants can be directly oxidised to produce benzoic acid given in the diagram? (Directly oxidised = Oxidation from alkaline aqueous potassium manganate (VII) and then acidified with dilute sulfuric acid)

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Answer explanation

Methylbenzene