Organic chemistry quiz (unit 4)

Descrição

A-Level Chemistry (Organic chemistry) Quiz sobre Organic chemistry quiz (unit 4), criado por Stephen Cole em 11-08-2014.
Stephen Cole
Quiz por Stephen Cole, atualizado more than 1 year ago
Stephen Cole
Criado por Stephen Cole mais de 10 anos atrás
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Resumo de Recurso

Questão 1

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

Questão 2

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

Questão 3

Questão
What catalyst is used in Friedel-Crafts acylation reactions?
Responda
  • Concentrated sulphuric acid
  • Iron
  • Concentrated phosphoric acid
  • 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
  • Electrophilic addition
  • Hydrolysis

Questão 5

Questão
Which of the following is not a use of esters?
Responda
  • Soap
  • Flavourings
  • Cooking oil
  • 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)
  • Tollens' reagent
  • Acidifed potassium dichromate(VI)

Questão 9

Questão
Which of the following are products of a Friedel-Crafts acylation reaction?
Responda
  • Hydrochloric acid
  • Water
  • Acyl chloride
  • Aromatic ketone
  • Benzene
  • Acylium ion
  • 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.
  • Ethanoic anhydride is cheaper.
  • 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
  • A primary alcohol
  • 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
  • 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
  • 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

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
  • Pentan-3-ol and benzoic acid
  • Pentan-2-ol and benzoic acid
  • Propanol and 1-ethylbenzoic acid

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