CARBONYL COMPOUNDS

CARBONYL COMPOUNDS

Assessment

Assessment

Created by

Unitkimia Kmkt

Chemistry

University

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10 questions

Show answers

1.

Multiple Choice

30 sec

1 pt

Which of the following is not a carbonyl compound?

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2.

Multiple Choice

30 sec

1 pt

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?

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3.

Multiple Choice

1 min

1 pt

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

45 sec

1 pt

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

1 min

1 pt

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

30 sec

1 pt

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

Propanal

Propanone

Propanoic acid

1-propanol

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