HARD
AS and A Level
IMPORTANT
Earn 100
The melting points of the derivatives of the reaction between -DNPH and various aldehydes and ketones are shown in the table.
Describe your observations when each of the carbonyl compounds in the table is mixed with -DNPH.
Important Questions on Carbonyl Compounds
HARD
AS and A Level
IMPORTANT
Write a half equation to show silver ions acting as an oxidising agent in a positive test for an aldehyde.
MEDIUM
AS and A Level
IMPORTANT
Write a half equation to show copper (II) ions acting as an oxidising agent in a positive test for an aldehyde.
HARD
AS and A Level
IMPORTANT
When a propanone is warmed with an alkaline iodine solution, a yellow precipitate is formed. Name and draw the displayed formula of the yellow precipitate.
HARD
AS and A Level
IMPORTANT
Give the structural formulae of the organic products formed in both the steps of reaction of propanone warmed with an alkaline iodine solution, a yellow precipitate is formed.
HARD
AS and A Level
IMPORTANT
Explain, naming any organic products formed, why ethanol gives a positive test (yellow precipitate) when warmed with alkaline iodine solution.
HARD
AS and A Level
IMPORTANT
Which of these compounds will give a yellow precipitate when treated with alkaline aqueous iodine?
EASY
AS and A Level
IMPORTANT
Name the following compound:
MEDIUM
AS and A Level
IMPORTANT
Name the reagent you would add to an unknown compound to test if it contains a carbonyl group.
