1136389
Descrição
Quiz por Stephen Cole, atualizado more than 1 year ago
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Criado por Stephen Cole
aproximadamente 10 anos atrás
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Questão 1
Questão
In the formation of nitrobenzene from benzene, what is the role of the nitronium ion?
Responda
-
Nucleophile
-
Electrophile
-
Catalyst
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Reducing agent
Questão 2
Questão
Which of the following will produce effervescence when added to sodium hydrogencarbonate?
Responda
-
Ethanoyl chloride
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Ethanol
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Ethanoic acid
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Ethanoic anhydride
Questão 3
Questão
What catalyst is used in Friedel-Crafts acylation reactions?
Responda
-
Concentrated sulphuric acid
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Iron
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Concentrated phosphoric acid
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Aluminium chloride
Questão 4
Questão
Which TWO types of reaction are involved in the formation of lactic acid from ethanal?
Responda
-
Nucleophilic addition
-
Nucleophilic substitution
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Electrophilic addition
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Hydrolysis
Questão 5
Questão
Which of the following is not a use of esters?
Responda
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Soap
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Flavourings
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Cooking oil
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Solvents
Questão 6
Questão
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
Responda
-
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
Questão 7
Questão
Racemic mixtures are optically inactive.
Responda
- True
- False
Questão 8
Questão
What is the reducing agent used to reduce aldehydes and ketones to alcohols?
Responda
-
Hydrogen
-
Sodium tetrahydridoborate(III)
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Tollens' reagent
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Acidifed potassium dichromate(VI)
Questão 9
Questão
Which of the following are products of a Friedel-Crafts acylation reaction?
Responda
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Hydrochloric acid
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Water
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Acyl chloride
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Aromatic ketone
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Benzene
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Acylium ion
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Tetrachloroaluminate ion
Questão 10
Questão
A chiral compound is one which exhibits geometric isomerism.
Responda
- True
- False
Questão 11
Questão
Which of the following is NOT a reason why ethanoic anhydride is preferred over ethanoyl chloride in the industrial synthesis of aspirin?
Responda
-
Ethanoic anhydride reacts more easily with salicylic acid.
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Ethanoic anhydride is cheaper.
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Ethanoic anhydride is safer.
-
Ethanoic anhydride does not react easily with water.
Questão 12
Questão
What is the reduction product of the reaction of an aldehyde with Tollens' reagent?
Responda
-
A carboxylic acid
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A primary alcohol
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Silver
-
Ammonia
Questão 13
Questão
Benzene will undergo which of the following reactions?
Responda
-
Nucleophilic substitution
-
Nucleophilic addition
-
Electrophilic substitution
-
Electrophilic addition
Questão 14
Questão
What mechanism is involved in the reduction of ketones to secondary alcohols?
Responda
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Elimination
-
Electrophilic addition
-
Nucleophilic substitution
-
Nucleophilic addition
Questão 15
Questão
Ethanoic anhydride is more reactive than ethanoyl chloride.
Responda
- True
- False
Questão 16
Questão
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?
Responda
-
The enantiomers reflect polarised light in opposite directions
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Enzymes are specific to optical isomers, so one of them is likely to be ineffective
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One of the isomers may have harmful side effects
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Racemates are toxic
-
Laboratory reactions should never produce racemates
Questão 17
Questão
Positive enantiomers reflect a plane of polarised light anticlockwise.
Responda
- True
- False
Questão 18
Questão
What are the products of the reaction of 1-ethylpropylbenzoate with water?
Responda
-
Phenol and 2-methylbutanoic acid
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Pentan-3-ol and benzoic acid
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Pentan-2-ol and benzoic acid
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Propanol and 1-ethylbenzoic acid
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