Carbonyl Compounds Exam-style MCQs | A-Level Chemistry CIE

Question 1

Propanone has a much higher boiling temperature than butane.

The main reason for this is

A

propanone has permanent dipole-dipole forces between its molecules while butane does not

B

propanone forms hydrogen bonds between its molecules while butane does not

C

propanone has stronger induced dipole-dipole forces between its molecules than butane

D

the carbon-oxygen double bond in propanone is very strong

0

/

1

Question 2

Ethanal may be prepared by

A

heating ethanoic acid with lithium aluminium hydride in dry ether

B

refluxing a mixture of bromoethane and aqueous sodium hydroxide

C

refluxing a mixture of ethanol and acidified potassium dichromate(VI)

D

distilling from a mixture of ethanol and acidified potassium dichromate(VI)

0

/

1

Question 3

CH₃CH₂COCH₂CH₃reacts with hydrogen cyanide to form an organic product called a cyanohydrin.

Which feature applies to the cyanohydrin product?

A

it has one chiral centre

B

it is formed by electrophilic addition

C

it is formed via an intermediate which contains the C-OH group

D

its formation requires the use of cyanide ions as a catalyst

0

/

1

Question 4

What will react differently with the two isomeric alcohols, (CH₃)₃CCH₂OH and (CH₃)₂CHCH₂CH₂OH?

A

acidified aqueous potassium manganate(VII)

B

concentrated sulfuric acid

C

phosphorus pentachloride

D

sodium

0

/

1

Question 5

Which reagent will give similar results with both butanone and butanal?

A

acidified aqueous potassium dichromate(VI)

B

an alkaline solution containing complexed Cu²⁺ ions (Fehling’s solution)

C

an aqueous solution containing [Ag(NH₃)₂]⁺(Tollens’ reagent)

D

2,4-dinitrophenylhydrazine reagent

0

/

1

Question 6

Compound X contains two functional groups.

Which reagent will react with only one of the functional groups?

A

acidified potassium dichromate(VI)

B

2,4-DNPH reagent

C

hydrogen cyanide

D

NaBH₄

0

/

1

Question 7

3-methylbutanone is treated with alkaline aqueous iodine. The mixture of products is then acidified.

Which compound is present in the final mixture of products?

A

3-methylbutanoic acid

B

butanoic acid

C

methylpropanoic acid

D

propanoic acid

0

/

1

Question 8

Structural isomerism and stereoisomerism should be considered when answering this question.

Each of the following carbonyl compounds is reacted with NaBH₄. The product of each reaction is heated with concentrated phosphoric acid at 170°C, generating one product or a mixture of isomers.

Which carbonyl compound will produce the most isomers?

A

butanal

B

butanone

C

pentan-3-one

D

propanone

0

/

1

Question 9

Ketones react with hydrogen cyanide, HCN, in the presence of cyanide ions, CN^-.

Which of these ketones does not form a racemic mixture in this reaction?

A

CH₃CH₂CH₂COCH₃

B

CH₃CH₂COCH₂CH₃

C

CH₃CH₂CH₂CH₂COCH₃

D

CH₃CH₂CH₂COCH₂CH₃

0

/

1

Question 10

Ketones react with hydrogen cyanide, HCN, in the presence of cyanide ions, CN^-.

This type of reaction is classified as

A

nucleophilic substitution

B

nucleophilic addition

C

electrophilic addition

D

electrophilic substitution

0

/

1

Question 11

Name the functional group in HCHO.

A

aldehyde

B

ketone

C

alcohol

D

carboxylic acid

0

/

1

Question 12

What is the functional group in C₆H₅COCH₃?

A

aldehyde

B

carboxylic acid

C

ester

D

ketone

0

/

1

Question 13

Which of the following compounds would form an orange-red precipitate when heated with Fehling’s solution?

A

CH₃CH₂CN

B

CH₃CH₂COOH

C

CH₃CHO

D

CH₃COCH₃

0

/

1

Question 14

Which alcohol could not be produced by the reduction of an aldehyde or a ketone?

A

2,2-dimethylpropan-1-ol

B

2-methylbutan-2-ol

C

3-methylbutan-2-ol

D

pentan-3-ol

0

/

1

Question 15

Which compound forms optically active compounds on reduction?

A

CH₃CH₂C(CH₃)=CHCH₃

B

CH₃CH₂C(CH₃)=CH₂

C

CH₃COCH₃

D

CH₃CH₂COCH₃

0

/

1