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WorksheetsCARBONYL COMPOUNDS
Total questions: 10
Worksheet time: 7mins
Which of the following is not a carbonyl compound?
An organic compound X has the following chemical properties.
· Forms a yellow precipitate when tested with 2,4-dinitrophenylhydrazine.
· Forms a yellow precipitate when it reacts with an excess iodine in alkaline solution.
Which of the following compounds is X?
Which of the following alcohols can be oxidised to 2-methyl-3-pentanone?
CH3CH2CH(OH)CH3
CH3CH(OH)CH2CH2CH3
(CH3)3CCH(OH)CH3
(CH3)2CHCH(OH)CH2CH3
The following reaction scheme shows how propene can be prepared from propanal in two stages using reagents X and Y. 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-DNPH 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 reagent would you choose to convert 1-pentanol to pentanal?
PCC in CH2Cl2
K2Cr2O7 with aqueous H2SO4
KMnO4 with aqueous H2SO4
KOH, ethanol, reflux
Which statement about butanone is correct?
The C=O of butanone is polar with O δ–
Butanone can be prepared by reduction of 1-butanol
Butanone forms brick red precipitate with Fehling’s reagent
Butanone form cloudy solution with Lucas test
What is the reagent to differentiate between a benzaldehyde and a ketone
Acidified potassium dichromate (VI) solution
Tollen’s reagent, [Ag(NH3)2]+
Fehling’s solution containing complex ions of Cu2+
