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CAIE A-Level Chemistry AS 16.1 Alcohols Questions

Practise classifying and reacting alcohols, using oxidation, reduction, iodoform evidence and O-H acidity to identify products.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • distinguish primary, secondary and tertiary alcohols from oxidation products or no oxidation
  • apply alkaline I2(aq) evidence to identify CH3CH(OH)- groups from a yellow precipitate
  • write alcohol reaction equations with sodium or reduction products using [H] where required

Covered syllabus points

16.1.1—Preparation of alcohols16.1.2—Describe16.1.3—Classify alcohols as primary, secondary16.1.4—CH3CH(OH)- alcohol identification16.1.5—Acidity of alcohols compared with water

Question 1

[Maximum number: 1]

The conversion of propan-1-ol into propan-2-ol can be completed in a two-stage synthesis.
The first stage is to heat the propan-1-ol with concentrated sulfuric acid.

Which reagent would be needed to complete the second stage?

A

cold dilute acidified manganate(VII) ions

B

hot concentrated acidified manganate(VII) ions

C

steam with phosphoric acid

D

aqueous sodium hydroxide

Question 2

[Maximum number: 1]

Compound X is a single, pure, optical isomer. Compound X is heated with an excess of concentrated H2SO4\mathrm{H}_{2} \mathrm{SO}_{4}. Only one organic product is formed.

What is compound X ?

A
Figure for Question 2 — CAIE A-Level Chemistry AS — Option A
B
Figure for Question 2 — CAIE A-Level Chemistry AS — Option B
C
Figure for Question 2 — CAIE A-Level Chemistry AS — Option C
D
Figure for Question 2 — CAIE A-Level Chemistry AS — Option D

Question 3

[Maximum number: 1]

Which compound is a secondary alcohol that can be dehydrated to form an alkene with Mr=70M_{\mathrm{r}}=70 ?

A
Figure for Question 3 — CAIE A-Level Chemistry AS — Option A
B
Figure for Question 3 — CAIE A-Level Chemistry AS — Option B
C
Figure for Question 3 — CAIE A-Level Chemistry AS — Option C
D
Figure for Question 3 — CAIE A-Level Chemistry AS — Option D

Question 4

[Maximum number: 1]

Four different alcohols are treated with alkaline I2(aq)\mathrm{I}_{2}(\mathrm{aq}).
Which row is correct?

name of alcohol

formulae of products

butan-2-ol

CH3COO−\mathrm{CH}_{3} \mathrm{COO}^{-} and CH3CI3\mathrm{CH}_{3} \mathrm{CI}_{3}

propan-1-ol

CH3COO−\mathrm{CH}_{3} \mathrm{COO}^{-} and CHI3\mathrm{CHI}_{3}

propan-2-ol

CH3COO−\mathrm{CH}_{3} \mathrm{COO}^{-} and CHI3\mathrm{CHI}_{3}

butan-2-ol

CH3CH2COO−\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COO}^{-} and CH3I\mathrm{CH}_{3} \mathrm{I}

Question 5

[Maximum number: 1]

When ethanol reacts with sodium metal, ethoxide ions, CH3CH2O−\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{O}^{-}, are produced.
When water reacts with sodium metal, OH−\mathrm{OH}^{-} ions are produced.

Which statement about these reactions and the ethoxide ion is correct?

A

At the same temperature, the rate of reaction between sodium and ethanol is greater than that between sodium and water.

B

CH3CH2O−\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{O}^{-} is a stronger base than OH−\mathrm{OH}^{-} due to the electron-donating effect of the ethyl group.

C

The negative charge on the oxygen in an ethoxide ion is delocalised.

D

It is easier to deprotonate ethanol as it is more acidic than water.

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