CHEMICAL TEST FOR CARBONYL COMPOUNDS

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

• Propanal

• Propanone

• Propanoic acid

• 1-propanol

Carbonyl compounds that give pale yellow precipitate with iodoform test must have contains..

• methyl carbinol group

• methyl carbonyl group

• carboxyl group

• carboalkoxy group

The only aldehyde that gives positive result with I₂/NaOH is

• Butanal

• 2-methylpropanal

• Ethanal

• Propanal

Which chemical test suitable to identify carbonyl group?

• Lucas Test

• Iodoform Test

• Brady's Test

• Tollen's Test

Give a suitable chemical test to differentiate between

butanal and 2-butanone

• Lucas Test

• Brady's Test

• Hinsberg's Test

• Tollen's Test

Compound M, C₇H₆O gives a brick red precipitate when react with Cu²⁺ ion in basic medium.

State the name of chemical test involved:

• Schiff test

• Fehling's test

• Tollen's test

• Brady test

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

• X = CH₃COCH₃

  Y = CH₃COOH

• X = CH₃CH(OH)CH₃

  Y = CH₃COCH₃

• X = CH₃CH₂CH₂OH

  Y = CH₃COCH₃

• X = CH₃CH₂CH₂OH

  Y = CH₃CH₂CHO

Tollen's reagent is used to identify the presence of aldehyde by giving the result of

• yellow precipitate

• silver mirror

• cloudy

• brown precipitate

Give a suitable chemical test to differentiate between

butanol and butanal

• Lucas Test

• Brady's Test

• Hinsberg's Test

• Tollen's Test