1136389
Descripción
Test por Stephen Cole, actualizado hace más de 1 año
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Creado por Stephen Cole
hace más de 9 años
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Pregunta 1
Pregunta
In the formation of nitrobenzene from benzene, what is the role of the nitronium ion?
Respuesta
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Nucleophile
-
Electrophile
-
Catalyst
-
Reducing agent
Pregunta 2
Pregunta
Which of the following will produce effervescence when added to sodium hydrogencarbonate?
Respuesta
-
Ethanoyl chloride
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Ethanol
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Ethanoic acid
-
Ethanoic anhydride
Pregunta 3
Pregunta
What catalyst is used in Friedel-Crafts acylation reactions?
Respuesta
-
Concentrated sulphuric acid
-
Iron
-
Concentrated phosphoric acid
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Aluminium chloride
Pregunta 4
Pregunta
Which TWO types of reaction are involved in the formation of lactic acid from ethanal?
Respuesta
-
Nucleophilic addition
-
Nucleophilic substitution
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Electrophilic addition
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Hydrolysis
Pregunta 5
Pregunta
Which of the following is not a use of esters?
Respuesta
-
Soap
-
Flavourings
-
Cooking oil
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Solvents
Pregunta 6
Pregunta
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
Respuesta
-
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
Pregunta 7
Pregunta
Racemic mixtures are optically inactive.
Respuesta
- True
- False
Pregunta 8
Pregunta
What is the reducing agent used to reduce aldehydes and ketones to alcohols?
Respuesta
-
Hydrogen
-
Sodium tetrahydridoborate(III)
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Tollens' reagent
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Acidifed potassium dichromate(VI)
Pregunta 9
Pregunta
Which of the following are products of a Friedel-Crafts acylation reaction?
Respuesta
-
Hydrochloric acid
-
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
Pregunta 10
Pregunta
A chiral compound is one which exhibits geometric isomerism.
Respuesta
- True
- False
Pregunta 11
Pregunta
Which of the following is NOT a reason why ethanoic anhydride is preferred over ethanoyl chloride in the industrial synthesis of aspirin?
Respuesta
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Ethanoic anhydride reacts more easily with salicylic acid.
-
Ethanoic anhydride is cheaper.
-
Ethanoic anhydride is safer.
-
Ethanoic anhydride does not react easily with water.
Pregunta 12
Pregunta
What is the reduction product of the reaction of an aldehyde with Tollens' reagent?
Respuesta
-
A carboxylic acid
-
A primary alcohol
-
Silver
-
Ammonia
Pregunta 13
Pregunta
Benzene will undergo which of the following reactions?
Respuesta
-
Nucleophilic substitution
-
Nucleophilic addition
-
Electrophilic substitution
-
Electrophilic addition
Pregunta 14
Pregunta
What mechanism is involved in the reduction of ketones to secondary alcohols?
Respuesta
-
Elimination
-
Electrophilic addition
-
Nucleophilic substitution
-
Nucleophilic addition
Pregunta 15
Pregunta
Ethanoic anhydride is more reactive than ethanoyl chloride.
Respuesta
- True
- False
Pregunta 16
Pregunta
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?
Respuesta
-
The enantiomers reflect polarised light in opposite directions
-
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
Pregunta 17
Pregunta
Positive enantiomers reflect a plane of polarised light anticlockwise.
Respuesta
- True
- False
Pregunta 18
Pregunta
What are the products of the reaction of 1-ethylpropylbenzoate with water?
Respuesta
-
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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