Organic chemistry quiz (unit 4)

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A-Level Chemistry (Organic chemistry) Quiz on Organic chemistry quiz (unit 4), created by Stephen Cole on 11/08/2014.
Stephen Cole
Quiz by Stephen Cole, updated more than 1 year ago
Stephen Cole
Created by Stephen Cole about 10 years ago
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Resource summary

Question 1

Question
In the formation of nitrobenzene from benzene, what is the role of the nitronium ion?
Answer
  • Nucleophile
  • Electrophile
  • Catalyst
  • Reducing agent

Question 2

Question
Which of the following will produce effervescence when added to sodium hydrogencarbonate?
Answer
  • Ethanoyl chloride
  • Ethanol
  • Ethanoic acid
  • Ethanoic anhydride

Question 3

Question
What catalyst is used in Friedel-Crafts acylation reactions?
Answer
  • Concentrated sulphuric acid
  • Iron
  • Concentrated phosphoric acid
  • Aluminium chloride

Question 4

Question
Which TWO types of reaction are involved in the formation of lactic acid from ethanal?
Answer
  • Nucleophilic addition
  • Nucleophilic substitution
  • Electrophilic addition
  • Hydrolysis

Question 5

Question
Which of the following is not a use of esters?
Answer
  • Soap
  • Flavourings
  • Cooking oil
  • Solvents

Question 6

Question
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
Answer
  • 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

Question 7

Question
Racemic mixtures are optically inactive.
Answer
  • True
  • False

Question 8

Question
What is the reducing agent used to reduce aldehydes and ketones to alcohols?
Answer
  • Hydrogen
  • Sodium tetrahydridoborate(III)
  • Tollens' reagent
  • Acidifed potassium dichromate(VI)

Question 9

Question
Which of the following are products of a Friedel-Crafts acylation reaction?
Answer
  • Hydrochloric acid
  • Water
  • Acyl chloride
  • Aromatic ketone
  • Benzene
  • Acylium ion
  • Tetrachloroaluminate ion

Question 10

Question
A chiral compound is one which exhibits geometric isomerism.
Answer
  • True
  • False

Question 11

Question
Which of the following is NOT a reason why ethanoic anhydride is preferred over ethanoyl chloride in the industrial synthesis of aspirin?
Answer
  • Ethanoic anhydride reacts more easily with salicylic acid.
  • Ethanoic anhydride is cheaper.
  • Ethanoic anhydride is safer.
  • Ethanoic anhydride does not react easily with water.

Question 12

Question
What is the reduction product of the reaction of an aldehyde with Tollens' reagent?
Answer
  • A carboxylic acid
  • A primary alcohol
  • Silver
  • Ammonia

Question 13

Question
Benzene will undergo which of the following reactions?
Answer
  • Nucleophilic substitution
  • Nucleophilic addition
  • Electrophilic substitution
  • Electrophilic addition

Question 14

Question
What mechanism is involved in the reduction of ketones to secondary alcohols?
Answer
  • Elimination
  • Electrophilic addition
  • Nucleophilic substitution
  • Nucleophilic addition

Question 15

Question
Ethanoic anhydride is more reactive than ethanoyl chloride.
Answer
  • True
  • False

Question 16

Question
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?
Answer
  • 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

Question 17

Question
Positive enantiomers reflect a plane of polarised light anticlockwise.
Answer
  • True
  • False

Question 18

Question
What are the products of the reaction of 1-ethylpropylbenzoate with water?
Answer
  • Phenol and 2-methylbutanoic acid
  • Pentan-3-ol and benzoic acid
  • Pentan-2-ol and benzoic acid
  • Propanol and 1-ethylbenzoic acid
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