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Organic Chemistry: Aldehydes, Ketones, and Carboxylic Acids - SS3 Chemistry Past Questions and Answers - page 1

1

Which of the following functional groups is present in both aldehydes and ketones?

 

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A

Alcohol

 

B

Carboxylic acid

 

C

Carbonyl

 

D

Ester

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2

Which of the following compounds is an aldehyde?

 

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A

Acetone

 

B

Ethanol

 

C

Propanal

 

D

Butanone

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3

Which of the following reagents can be used to distinguish between an aldehyde and a ketone?

 

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A

Tollen's reagent

 

B

Fehling's solution

 

C

Sodium hydroxide

 

D

Sodium chloride

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4

What is the general formula of aldehydes?

 

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A

R-OH

 

B

R-CO-R

 

C

R-CO-R'

 

D

R-CHO

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5

Which of the following reactions is a characteristic test for aldehydes?

 

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A

Addition of ammonia

 

B

Formation of a silver mirror with Tollens's reagent

 

C

Esterification reaction

 

D

Formation of a carboxylic acid with a primary alcohol

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6

Which of the following compounds is a ketone?

 

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A

Methanal

 

B

Ethanal

 

C

Propanone

 

D

Butanal

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7

Which of the following aldehydes is used as a preservative in the food industry?

 

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A

Formaldehyde

 

B

Benzaldehyde

 

C

Acetaldehyde

 

D

Propionaldehyde

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8

Aldehydes and ketones can be reduced to form:

 

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A

Alcohols

 

B

Carboxylic acids

 

C

Esters

 

D

Amines

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9

Which of the following reactions is used to distinguish between an aldehyde and a ketone?

 

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A

Formation of a silver mirror with Tollens's reagent

 

B

Formation of a precipitate with Fehling's solution

 

C

Formation of a carboxylic acid with a primary alcohol

 

D

Formation of an ester with an alcohol

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10

Which of the following aldehydes is commonly found in cinnamon oil?

 

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A

Formaldehyde

 

B

Benzaldehyde

 

C

Acetaldehyde

 

D

Propanal

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