15B Carbonyls

Propanal is an isomer of propanone. Which of the following reagents does propanone react with.

• Lithium tetrahydridoaluminate (III)
• Fehling’s solution
• Tollens’ reagent
• Acidified potassium dichromate(VI)
• None

What will be seen when Fehling´s solution reacts with propanal?

• Red precipitate
• Silver mirror
• Green solution
• Brown precipitate
• None

What will be seen when Tollen´s reagent reacts with propanal?

• Red precipitate
• Silver mirror
• Green solution
• Brown precipitate
• None

What will be seen when acidified potassium dichromate reacts with propanal?

• Red precipitate
• Silver mirror
• Green solution
• Brown precipitate
• None

What type of reactions does propanal undergo that propanone does not?

• Oxidation
• Reduction
• Addition
• Polymerisation
• None

Give the structural formula of propanoic acid. (End with functional group)

What does 2,4-dinitrophenylhydrazine test for.

• Aldhydes only
• Ketones only
• Aldehyes and ketones
• Any C=O group

When propanone reacts with lithium tetrahydridoaluminate(III), water is not a suitable solvent.

• Reagent is oxidised to produce hydrogen.

• Water does not dissolve propanone
• Water does not dissolve lithium tetrahydridoaluminate (III)
• Water oxidises propanone to a carboxylic acid.

What is produced when propanone and iodine react in the presence of an acid catalyst?

• CH₃COCH₂I

• CHI₃

• CH₃COONa

When propanone and iodine react in alkaline conditions a pale, yellow precipitate forms. What is this precipitate?

• CH₃COCH₂I

• CHI₃

• CH₃COONa