Organic Chemistry III: Aldehydes, Ketones, and Carboxylic Acids - SS2 Chemistry Past Questions and Answers (page 1)

1

Which of the following compounds is an aldehyde?

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A

Butanal

B

Benzaldehyde

C

Acetophenone

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2

How are aldehydes named according to the IUPAC nomenclature system?

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A

By replacing the -e ending of the corresponding alkane with -al

B

By replacing the -e ending of the corresponding alkane with -one

C

By replacing the -e ending of the corresponding alkane with -aldehyde

D

By replacing the -e ending of the corresponding alkene with -al

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3

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

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A

Carbonyl group

B

Hydroxyl group

C

Carboxyl group

D

Ester group

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4

Which of the following compounds is a ketone?

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A

Methanal

B

Ethanol

C

Acetone

D

Butanoic acid

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5

What is the general formula for aldehydes?

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A

R-OH

B

R-COOH

C

R-CHO

D

R-CO-R

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6

Which of the following statements is true about the boiling points of aldehydes and ketones?

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A

Aldehydes have higher boiling points than ketones.

B

Ketones have higher boiling points than aldehydes.

C

Aldehydes and ketones have similar boiling points.

D

Boiling points cannot be determined based on the functional group.

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7

Which of the following reactions is characteristic of aldehydes?

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A

Aldol condensation

B

Cannizzaro reaction

C

Friedel-Crafts acylation

D

Claisen condensation

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8

Which of the following properties is characteristic of ketones?

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A

Strong reducing agents

B

Easily oxidised to carboxylic acids

C

Exhibit keto-enol tautomerism

D

React with sodium bicarbonate to produce carbon dioxide

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9

Which of the following tests is used to distinguish between aldehydes and ketones?

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A

Fehling's test

B

Tollen's test

C

Lucas test

D

Iodoform test

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10

Which of the following functional groups is present in aldehydes but not in ketones?

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A

Hydroxyl group

B

Carboxyl group

C

Amine group

D

Alkyl group

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Organic Chemistry III: Aldehydes, Ketones, and Carboxylic Acids - SS2 Chemistry Past Questions and Answers - page 1