Aldehydes,Ketones and Carboxylic acids

Which is a test for a C=O?

• Bromine water

• Fehling's solution

• Acidified potassium dichromate (VI)

• 2,4-DNPH (Brady's reagent)

Which of the following tests would give a positive result for propan-1-ol?

• The iodoform test (NaOH + I₂)

• Tollen's reagent (silver mirror test)

• PCl₅ (phosphorus pentachloride)

• 2,4-DNPH (Brady's reagent)

Tags

NGSS.HS-PS1-2

Name this molecule:

• Propanone

• Propanal

• Butanone

• Butanal

Tags

NGSS.HS-PS1-1

Name this molecule and give its functional group.

• Carboxylic acid - propanoic acid

• Ester - methyl ethanoate

• Ester - ethyl methanoate

• Carboxylic acid - methyl ethanoic acid

What will be formed if butanone is reacted with LiAlH₄ in dry ether?

• Butanoic acid

• Butan-1-ol

• Butan-2-ol

• Butanal

Tags

NGSS.HS-PS1-2

What is the name of the mechanism when KCN (in acidic conditions) reacts with propanal?

• Free radical substitution

• Nucleophilic substitution

• Nucleophilic addition

• Electrophilic addition

Tags

NGSS.HS-PS1-2

Name this molecule:

• Pentanoic acid

• 2-hydroxy-2-methylbutan3-one

• 3-hydroxy-3-methylbutane-2-one

• 2-oxo-3-methylbutan-3-ol

Which of the following reagents will oxidise propan-1-ol to propanal (tick all that apply)?

• Acidified potassium dichromate (VI)

• 2,4-DNPH (Brady's reagent)

• Fehling's solution

• PCl₅ (phosphorus pentachloride)

What observations would you expect to see in a positive Fehlings test for an aldehyde?

• blue solution to brick-red solution
• blue solid to brick-red solution
• blue solution to brick-red solid
• blue solid to brick-red solid

Which of these compounds does not react with Brady's reagent?

• propanoic acid
• propanal
• propanol
• propanone