Carbonyl Compounds

Give the IUPAC name for the following compound

• 2-methyl-3-butanone

• 3-methyl-3-butanone

• 3-methyl-2-butanone

• 3-methylbutanone

Which reagent would you choose to convert 1-pentanol to pentanal?

• PCC in CH₂Cl₂

• K₂Cr₂O₇ with aqueous H₂SO₄

• KMnO₄ with aqueous H₂SO₄

• KOH, ethanol, reflux

The following reaction scheme shows how propene can be prepared from propanal in two stages using reagents X and Y respectively. Which of the following are the reagents X and Y?

X Y

CH₃CH₂CHO → CH₃CH₂CH₂OH → H₃CH=CH₂

• X: LiAlH₄ ; Y: KOH, ethanol, reflux

• X: NaBH₄ ; Y: conc.H₂SO₄, heat

• X: dillute H₂SO₄ ; Y: conc.ethanol, reflux

• X: dillute H₂SO₄ ; Y: KOH, ethanol, reflux

On heating compound X with acidified KMnO₄, compound Y is obtained. Compound Y does not react with Fehling’s solution. X and Y are most likely to be,

Compound X Compound Y

• CH₃COCH₃ CH₃COOH

• CH₃CH(OH)CH₃ CH₃COCH₃

• CH₃CH₂CH₂OH CH₃COCH₃

• CH₃CH₂CH₂OH CH₃CH₂CHO

Which substance would test positively with 2,4-DNP but negatively with Tollens’ reagent?

• Propanal

• Propanone

• Propanoic acid

• 1-propanol

Acetone reacts with HCN to form a cyanohydrin. It is an example of

• Electrophilic addition

• Electrophilic substituition

• Nucleophilic addition

• Nucleophilic substituition

Which will show cannizzaro reaction?

• benzaldehyde

• formaldehyde

• Acetaldehyde

• None

Propanal can be differentiated from propanone by using

• A. Tollen’s reagent

• B. Fehling Solution

• C. I₂/NaOH

• D.All

When reacted with an oxidising agent, secondary alcohols turn into

• carboxylic acids

• ketones

• primary alcohols

• aldehydes

When reacted with a strong reducing agent, aldehydes turn into

• carboxylic acids

• ketones

• primary alcohols

• secondary alcohols