Lesson 3.3.5.2
3.3.5.2 Oxidation of alcohols Quiz: AQA Chemistry, Unit 3
20 questions
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Lesson 3.3.5.2, Oxidation of alcohols: 20 multiple choice questions for the AQA Chemistry (7405), Unit 3: Organic chemistry, written with Revision Ninja.
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The 20 questions
-
What is the product formed when a primary alcohol is oxidised with distillation of the product?
- An alkene
- A ketone
- An aldehyde
- A carboxylic acid
-
What is the product of heating a primary alcohol under reflux with excess oxidising agent?
- A carboxylic acid
- A ketone
- An aldehyde
- An ester only
-
What is the product of oxidising a secondary alcohol?
- An alkene
- A carboxylic acid
- A ketone
- An aldehyde
-
Why are tertiary alcohols completely resistant to oxidation by acidified potassium dichromate?
- Steric hindrance prevents attack
- No hydrogen on carbon
- Too many methyl groups
- Strong carbon-carbon bonds
-
Which oxidising agent is used for the oxidation of alcohols in this specification?
- Ethanol
- Dilute sodium hydroxide
- Acidified potassium dichromate(VI)
- Sodium chloride solution
-
What is the colour change of acidified potassium dichromate(VI) during oxidation of an alcohol?
- Colourless to blue
- Purple to colourless
- Green to orange
- Orange to green
-
Write the equation for the oxidation of ethanol to ethanal using [O] as the oxidant.
- CH3CH2OH + [O] -> CH3CH3 + O2
- CH3CH2OH + 2[O] -> CH2=CH2 + 2H2O
- CH3CH2OH + [O] -> CH3CHO + H2O
- CH3CH2OH + [O] -> CH3COOH + H2O
-
What is the product when ethanol is oxidised fully to a carboxylic acid?
- Ethene
- Propanone
- Ethanal
- Ethanoic acid
-
Which compound is formed by oxidation of propan-2-ol?
- Propanoic acid
- Propanal
- Propanone
- Propan-1-ol
-
Which reagent is commonly used to distinguish between aldehydes and ketones?
- Acidified potassium manganate
- Universal indicator
- Bromine water
- Tollens' reagent
-
What observation occurs when an aldehyde reacts with Tollens' reagent?
- Silver mirror
- Orange precipitate
- Blue solution
- Red solution
-
What observation occurs when an aldehyde is warmed with Fehling's solution?
- Red precipitate
- White precipitate
- Silver mirror
- Steamy fumes
-
What is the result of adding Tollens' reagent to a ketone?
- A red precipitate forms
- A green solution forms
- A silver mirror forms
- No reaction occurs
-
Which technique prevents an aldehyde from being oxidised further to a carboxylic acid?
- Distillation
- Recrystallisation
- Filtration
- Reflux
-
What is the product of the oxidation of butan-1-ol using reflux with excess dichromate?
- Butan-2-one
- But-1-ene
- Butanoic acid
- Butanal
-
Which of these compounds gives a positive result with Tollens' reagent?
- Propanone
- Propan-2-ol
- Propanal
- Butane
-
What organic product forms when 2-methylpropan-2-ol is heated with acidified potassium dichromate(VI)?
- 2-methylpropanal
- 2-methylpropanoic acid
- No reaction
- 2-methylpropanone
-
Which inorganic product is formed during the oxidation of a primary alcohol?
- Water
- Hydrogen gas
- Carbon dioxide
- Oxygen gas
-
Why can aldehydes be distinguished from ketones using mild oxidising agents?
- Ketones easily oxidise
- Aldehydes reduce acids
- Ketones are acidic
- Aldehydes easily oxidise
-
Why are ketones resistant to further oxidation under standard conditions?
- O-H bond breaking
- C=O bond breaking
- C-H bond breaking
- C-C bond breaking
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