Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
What is the name of the reagent that forms a bright orange precipitate when reacted with aldehydes and ketones?
2,4-DNPH
Tollens' reagent
Fehling's solution
alkaline iodine solution
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Which of the following compounds does NOT react with 2,4-DNPH?
aldehydes
carboxylic acids
ketones
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How can the original carbonyl compound be identified after forming a derivative with 2,4-DNPH?
by measuring the derivative's boiling point
by measuring the derivative's solubility
by observing the derivative's colour
by measuring the derivative's melting point
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Which of the following reagents is a colourless solution containing complexed silver ions?
Tollens' reagent
Fehling's solution
acidified potassium dichromate
alkaline iodine solution
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What is the observation when an aldehyde is warmed with Tollens' reagent?
the solution turns from orange to green
a red precipitate forms
a silver mirror forms on the test tube walls
the solution remains colourless
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What is the observation when a ketone is warmed with Tollens' reagent?
a yellow precipitate forms
a red precipitate forms
the solution remains colourless
a silver mirror forms on the test tube walls
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Which of the following contains blue copper(II) complex ions dissolved in aqueous sodium hydroxide?
Tollens' reagent
Fehling's solution
alkaline iodine solution
acidified potassium dichromate
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What is the observation when an aldehyde is warmed with Fehling's solution?
the solution remains blue
a brick-red precipitate forms
a yellow precipitate forms
a silver mirror forms on the test tube walls
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What type of ketones can be detected using an alkaline iodine solution?
ethyl ketones
diketones
propyl ketones
methyl ketones
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What is the yellow precipitate formed when a methyl ketone is warmed with an alkaline iodine solution?
iodine (I2)
iodomethane (CH3I)
triiodomethane (CHI3)
sodium iodide (NaI)
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