Carbonyls and Carboxylic Acids (OCR A-Level Chemistry A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What does 2,4-dinitrophenylhydrazine (2,4-DNP) detect in a chemical test?
What does 2,4-dinitrophenylhydrazine (2,4-DNP) detect in a chemical test?
Any carbonyl group
What colour is Brady's reagent before reacting with a carbonyl compound?
What colour is Brady's reagent before reacting with a carbonyl compound?
Pale orange
What colour precipitate indicates a positive result with 2,4-DNP?
What colour precipitate indicates a positive result with 2,4-DNP?
Yellow or orange
What type of reaction occurs between 2,4-DNP and a carbonyl compound?
What type of reaction occurs between 2,4-DNP and a carbonyl compound?
Condensation reaction
Which type of carbonyl compound does Tollens' reagent specifically identify?
Which type of carbonyl compound does Tollens' reagent specifically identify?
Aldehydes only
What is the positive result when an aldehyde reacts with Tollens' reagent?
What is the positive result when an aldehyde reacts with Tollens' reagent?
Silver mirror forms
When should Tollens' reagent be prepared?
When should Tollens' reagent be prepared?
Immediately before use
What happens to silver ions in Tollens' test with an aldehyde?
What happens to silver ions in Tollens' test with an aldehyde?
Reduced to metallic silver
Why do ketones not react with Tollens' reagent?
Why do ketones not react with Tollens' reagent?
They resist oxidation
How can a specific carbonyl compound be identified after testing with 2,4-DNP?
How can a specific carbonyl compound be identified after testing with 2,4-DNP?
Melting point of the derivative