Lesson 3.3.14
3.3.14 Organic synthesis Quiz: AQA Chemistry, Unit 3
20 questions
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Lesson 3.3.14, Organic synthesis: 20 multiple choice questions for the AQA Chemistry (7405), Unit 3: Organic chemistry, written with Revision Ninja.
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The 20 questions
-
Why do industrial chemists aim to design organic syntheses that avoid solvents?
- Reduces hazardous waste
- Decreases reaction rate
- Increases activation energy
- Reduces atom economy
-
Why are synthetic routes with fewer reaction steps preferred in organic synthesis?
- Slower reaction rate
- Higher solvent volume
- Lower atom economy
- Higher overall yield
-
What is calculated by dividing the relative mass of desired product by total product mass?
- Reaction rate
- Atom economy
- Percentage yield
- Equilibrium constant
-
What is the maximum number of steps in a synthesis that students are expected to devise in this specification?
- Six
- Four
- Ten
- Two
-
What is the atom economy of the addition of HBr to ethene to form bromoethane?
- 75%
- 100%
- 50%
- 25%
-
What is the atom economy of CH3CH2Br + NaOH -> CH3CH2OH + NaBr?
- 93%
- 50%
- 31%
- 69%
-
Which reaction type has the highest atom economy in general?
- Addition
- Elimination
- Substitution with a by-product
- Oxidation with a by-product
-
Ethene is converted to ethanol and then to ethanoic acid. What is the minimum number of steps from ethene to ethanoic acid?
- 1
- 3
- 2
- 4
-
What is the minimum number of steps from ethanol to ethyl ethanoate?
- 1
- 2
- 4
- 3
-
What is the overall yield of a three-step synthesis where each step has a yield of 80%?
- 240%
- 80%
- 51.2%
- 24%
-
What is calculated by dividing actual product mass by theoretical product mass, multiplied by 100?
- Atom economy
- Percentage purity
- Empirical formula
- Percentage yield
-
Which factor directly affects percentage yield but not atom economy?
- Molecular formula
- Incomplete reaction
- Reaction stoichiometry
- Reactant molar masses
-
Which change makes an organic industrial synthesis route environmentally greener?
- Higher atom economy
- Higher reaction temperature
- Lower percentage yield
- Using toxic solvents
-
What is a key industrial benefit of a reaction with high atom economy?
- Higher product purity
- Greater activation energy
- Less waste produced
- Higher reaction rate
-
What is the atom economy of the elimination of water from ethanol to form ethene?
- 100%
- 50%
- 61%
- 39%
-
How is a primary alcohol oxidised to form an aldehyde rather than a carboxylic acid?
- Reflux with dichromate
- Distillation with water
- Reflux with sodium
- Distillation with dichromate
-
What is the atom economy of CH3CH2OH + [O] -> CH3CHO + H2O, where ethanal is the desired product?
- 71%
- 100%
- 50%
- 29%
-
Methane reacts with chlorine: CH4 + Cl2 -> CH3Cl + HCl. What is the atom economy for CH3Cl?
- 74%
- 42%
- 58%
- 100%
-
How is the overall percentage yield of a multi-step organic synthesis calculated?
- Highest yield
- Product of yields
- Mean of yields
- Sum of yields
-
Which experimental setup ensures a primary alcohol is fully oxidised to a carboxylic acid?
- Distillation with dichromate
- Reflux with hydroxide
- Reflux with dichromate
- Distillation with sodium
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