Organic Analysis (AQA A-Level Chemistry): Quizzes

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Identification of Functional Groups by Test-Tube Reactions
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What colour change occurs when a primary alcohol reacts with acidified K2Cr2O7K_2Cr_2O_7?

Orange to green

What happens when tertiary alcohol is warmed with acidified potassium dichromate?

No colour change, stays orange

What product forms when a primary alcohol is oxidised under reflux conditions?

Carboxylic acid

What product forms when a secondary alcohol is oxidised under reflux?

Ketone

What is the positive result when an aldehyde reacts with Fehling's solution?

Blue to brick-red precipitate

What is the positive result when an aldehyde is warmed with Tollens' reagent?

Silver mirror forms

What happens when a ketone is tested with Fehling's solution?

No change, remains blue

Which carbonyl compound can be further oxidised?

Aldehyde only

What observations confirm a carboxylic acid with sodium carbonate test?

Fizzing and limewater turns cloudy

What happens when an alkene is shaken with bromine water?

Orange decolourises to colourless

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