CARBONYL COMPOUNDS
Assessment
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Unitkimia Kmkt
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Chemistry
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University
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269 plays
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Hard
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10 questions
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1.
Multiple Choice
Which of the following is not a carbonyl compound?
2.
Multiple Choice
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?
3.
Multiple Choice
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
4.
Multiple Choice
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
5.
Multiple Choice
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
6.
Multiple Choice
Which substance would test positively with 2,4-DNPH but negatively with Tollens’ reagent?
Propanal
Propanone
Propanoic acid
1-propanol
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