Stephen Cole
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A-Level Chemistry (Organic chemistry) Quiz on Organic chemistry quiz (unit 4), created by Stephen Cole on 11/08/2014.

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Stephen Cole
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Organic chemistry quiz (unit 4)

Question 1 of 18

1

In the formation of nitrobenzene from benzene, what is the role of the nitronium ion?

Select one of the following:

  • Nucleophile

  • Electrophile

  • Catalyst

  • Reducing agent

Explanation

Question 2 of 18

1

Which of the following will produce effervescence when added to sodium hydrogencarbonate?

Select one of the following:

  • Ethanoyl chloride

  • Ethanol

  • Ethanoic acid

  • Ethanoic anhydride

Explanation

Question 3 of 18

1

What catalyst is used in Friedel-Crafts acylation reactions?

Select one of the following:

  • Concentrated sulphuric acid

  • Iron

  • Concentrated phosphoric acid

  • Aluminium chloride

Explanation

Question 4 of 18

1

Which TWO types of reaction are involved in the formation of lactic acid from ethanal?

Select one or more of the following:

  • Nucleophilic addition

  • Nucleophilic substitution

  • Electrophilic addition

  • Hydrolysis

Explanation

Question 5 of 18

1

Which of the following is not a use of esters?

Select one of the following:

  • Soap

  • Flavourings

  • Cooking oil

  • Solvents

Explanation

Question 6 of 18

1

Kekulé suggested that benzene had the structure cyclohexa-1,3,5-triene.
The enthalpy of hydrogenation of cyclohexene is -120kJ/mol, and that of benzene is -208kJ/mol.
This shows that

Select one of the following:

  • Kekulé's model is correct

  • Benzene is more thermodynamically stable than Kekulé's model suggests

  • Benzene is less thermodynamically stable than Kekulé's model suggests

  • Benzene is more reactive than Kekulé's model suggests

Explanation

Question 7 of 18

1

Racemic mixtures are optically inactive.

Select one of the following:

  • True
  • False

Explanation

Question 8 of 18

1

What is the reducing agent used to reduce aldehydes and ketones to alcohols?

Select one of the following:

  • Hydrogen

  • Sodium tetrahydridoborate(III)

  • Tollens' reagent

  • Acidifed potassium dichromate(VI)

Explanation

Question 9 of 18

1

Which of the following are products of a Friedel-Crafts acylation reaction?

Select one or more of the following:

  • Hydrochloric acid

  • Water

  • Acyl chloride

  • Aromatic ketone

  • Benzene

  • Acylium ion

  • Tetrachloroaluminate ion

Explanation

Question 10 of 18

1

A chiral compound is one which exhibits geometric isomerism.

Select one of the following:

  • True
  • False

Explanation

Question 11 of 18

1

Which of the following is NOT a reason why ethanoic anhydride is preferred over ethanoyl chloride in the industrial synthesis of aspirin?

Select one of the following:

  • Ethanoic anhydride reacts more easily with salicylic acid.

  • Ethanoic anhydride is cheaper.

  • Ethanoic anhydride is safer.

  • Ethanoic anhydride does not react easily with water.

Explanation

Question 12 of 18

1

What is the reduction product of the reaction of an aldehyde with Tollens' reagent?

Select one of the following:

  • A carboxylic acid

  • A primary alcohol

  • Silver

  • Ammonia

Explanation

Question 13 of 18

1

Benzene will undergo which of the following reactions?

Select one of the following:

  • Nucleophilic substitution

  • Nucleophilic addition

  • Electrophilic substitution

  • Electrophilic addition

Explanation

Question 14 of 18

1

What mechanism is involved in the reduction of ketones to secondary alcohols?

Select one of the following:

  • Elimination

  • Electrophilic addition

  • Nucleophilic substitution

  • Nucleophilic addition

Explanation

Question 15 of 18

1

Ethanoic anhydride is more reactive than ethanoyl chloride.

Select one of the following:

  • True
  • False

Explanation

Question 16 of 18

1

When synthesising drugs, manufacturers often find that they make a racemate due to the chirality of the drug. The enantiomers can be hard to separate. For what TWO reasons is this a problem?

Select one or more of the following:

  • The enantiomers reflect polarised light in opposite directions

  • Enzymes are specific to optical isomers, so one of them is likely to be ineffective

  • One of the isomers may have harmful side effects

  • Racemates are toxic

  • Laboratory reactions should never produce racemates

Explanation

Question 17 of 18

1

Positive enantiomers reflect a plane of polarised light anticlockwise.

Select one of the following:

  • True
  • False

Explanation

Question 18 of 18

1

What are the products of the reaction of 1-ethylpropylbenzoate with water?

Select one of the following:

  • Phenol and 2-methylbutanoic acid

  • Pentan-3-ol and benzoic acid

  • Pentan-2-ol and benzoic acid

  • Propanol and 1-ethylbenzoic acid

Explanation

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