Lesson 18C.2
18C.2 Planning multi-step reaction schemes Quiz: Pearson Edexcel Chemistry, Unit 18
20 questions
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Lesson 18C.2, Planning multi-step reaction schemes: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 18: Organic Chemistry III, written with Revision Ninja.
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The 20 questions
-
Which reagent dehydrates an alcohol to form an alkene?
- Acidified potassium dichromate
- Dilute sodium hydroxide
- Aqueous potassium cyanide
- Concentrated sulfuric acid
-
What is the product of heating bromoethane with sodium cyanide in ethanol?
- Ethanamide
- Ethanenitrile
- Butanenitrile
- Propanenitrile
-
Ethyl bromide reacts with magnesium in dry ether, then carbon dioxide, then dilute acid. What is the final organic product?
- Propanoic acid
- Butanoic acid
- Ethanoic acid
- Propan-1-ol
-
A Grignard reagent reacts with ethanal, followed by aqueous acid. What type of alcohol is formed?
- A tertiary alcohol
- A secondary alcohol
- A primary alcohol
- A carboxylic acid
-
A Grignard reagent reacts with propanone, followed by aqueous acid. What type of alcohol is formed?
- A secondary alcohol
- A primary alcohol
- A tertiary alcohol
- An alkene
-
What type of alcohol is formed when a Grignard reagent reacts with methanal?
- A primary alcohol
- A tertiary alcohol
- A carboxylic acid
- A secondary alcohol
-
Why must Grignard reagents be prepared in anhydrous conditions?
- Evaporates too quickly
- Requires light activation
- Reacts with water
- Reacts with nitrogen
-
What is the first step in converting ethene into ethanoic acid?
- Oxidation to ethanal
- Reduction to ethane
- Halogenation to bromoethane
- Hydration to ethanol
-
Which reagent increases the carbon chain length of 1-bromopropane?
- Sodium borohydride
- Potassium cyanide
- Potassium dichromate
- Potassium hydroxide
-
Which reagent acetylates 2-hydroxybenzoic acid to produce aspirin?
- Concentrated sulfuric acid
- Ethanoic anhydride
- Sodium borohydride
- Ethanoic acid
-
What is the main purpose of heating a reaction mixture under reflux?
- Lowers activation energy
- Prevents side reactions
- Prevents reactant loss
- Increases reaction rate
-
A synthesis gives 3.5 g of product from a theoretical yield of 6.0 g. What is the percentage yield?
- 43%
- 86%
- 58.3%
- 70%
-
Three steps each have a yield of 80%. What is the overall percentage yield?
- 240%
- 51.2%
- 24%
- 80%
-
Why must ethanoyl chloride be used inside a fume cupboard?
- Absorbs atmospheric oxygen
- Releases toxic HCl
- Explodes on contact
- Releases chlorine gas
-
Which reagent reacts with propanone to form 2-methylpropan-2-ol after acid work-up?
- Acidified potassium dichromate
- Sodium borohydride
- Concentrated sulfuric acid
- Methylmagnesium bromide
-
Why is steam distillation used for water-insoluble, heat-sensitive organic compounds?
- Prevents thermal decomposition
- Increases boiling point
- Increases reaction yield
- Prevents oxidation reactions
-
Which of these reaction types forms a new carbon-carbon bond?
- Alcohol oxidation
- Electrophilic addition
- Grignard reaction
- Free radical substitution
-
Which piece of apparatus is fitted vertically to a flask during reflux?
- Separating funnel
- Buchner funnel
- Fractionating column
- Liebig condenser
-
Calculate the overall percentage yield of a route with two steps giving 75% and 60% yields.
- 135%
- 67.5%
- 15%
- 45%
-
What organic product forms when ethanol is heated under reflux with excess acidified potassium dichromate(VI)?
- Ethene
- Ethane
- Ethanoic acid
- Ethanal
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