A LevelChemistryOCRExam Questions4. Core Organic ChemistryAlcohols

Alcohols (OCR A Level Chemistry A): Exam Questions

Exam code: H432

3 hours39 questions

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Alcohols

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1
1 mark

What is the correct systematic name and classification of the alcohol shown?

Skeletal formula showing CH3CHOHCHClCH2CH3

Systematic name

Classification

A

2-chloropentan-3-ol

Tertiary

B

2-chloropentan-3-ol

Secondary

C

3-chloropentan-2-ol

Tertiary

D

3-chloropentan-2-ol

Secondary

    Choose your answer

    2
    1 mark

    What is the main organic product formed when butan-2-ol is oxidised by heated under reflux with acidified potassium dichromate(VI)?

    • Butanal

    • Butanoic acid

    • Butanone

    • Butyl butanoate 

    Choose your answer

    3
    1 mark

    Which alcohol does not react with an acid catalyst to form an alkene?

    • CH3OH

    • CH3CH2OH

    • CH3CH(OH)CH3

    • CH3CH2CH2OH

    Choose your answer

    4
    1 mark

    Which alcohol can be oxidised by acidified potassium dichromate(VI) to form a carboxylic acid?

    • 3-methylhexan-1-ol

    • 3-methylhexan-3-ol

    • Butan-2-ol

    • Pentan-3-ol

    Choose your answer

    5
    1 mark

    What is the correct equation for the complete combustion of butanol?

    • C4H9OH + 4.5O2 → 4CO + 5H2O

    • C4H9OH + 6O2 → 4CO2 + 5H2O

    • C4H9OH + 6.5O2 → 4CO2 + 5H2O

    • C4H9OH + 8O2 → 4CO2 + 5H2O

    Choose your answer

    6
    1 mark

    Which equation for the oxidation of an alcohol is correct?

    • CH3CH(OH)CH3 + [O] → CH3CH2COOH + H2O

    • CH3CH(OH)CH3 + [O] → CH3CH2CHO + H2O

    • CH3CH(OH)CH3 + [O] → CH3COCH3 + H2O

    • (CH3)3COH → (CH3)2C=CH2 + H2O

    Choose your answer

    7
    1 mark

    Alcohols react with concentrated sulfuric acid and heat to form alkenes.

    What type of reaction is this?

    • Addition

    • Elimination

    • Oxidation

    • Substitution

    Choose your answer

    8
    1 mark

    What is the general formula of alcohols?

    • CnH2nOH

    • CnH2n+1OH

    • CnH2n+2OH

    • CnH2n+3O

    Choose your answer

    9
    1 mark

    Which of the following statements about ethanol is not true?

    • The strongest type of intermolecular force in ethanol is hydrogen bonding 

    • Ethanol is less soluble than pentan-2-ol 

    • Ethanol is produced during fermentation 

    • Ethanol is a primary alcohol

    Choose your answer

    10
    1 mark

    Ethanol reacts with NaCl and H2SO4 to form chloroethane.

    What type of reaction is this?

    • Addition

    • Elimination

    • Oxidation

    • Substitution

    Choose your answer

    1
    1 mark

    Which alcohol gives only one possible organic product when heated with acidified potassium dichromate(VI)?

    • 2-methylbutan-1-ol

    • 2-methylbutan-2-ol

    • Pentan-1-ol

    • Pentan-2-ol

    Choose your answer

    2
    1 mark

    The compound ‘leaf alcohol’ is partly responsible for the smell of new-mown grass.

    CH3CH2CH=CHCH2CH2OH

    leaf alcohol

    What is the main organic product formed when ‘leaf alcohol’ is heated under reflux with excess acidified potassium dichromate(VI)?

    • CH3CH2CH=CHCH2CHO

    • CH3CH2CH=CHCH2COOH

    • CH3CH2CH(OH)CH(OH)CH2COOH

    • CH3CH2COCOCH2COOH

    Choose your answer

    3
    1 mark

    Hydroxyethanal, HOCH2CHO, is heated under reflux with excess acidified potassium dichromate(VI).

    Which functional group is present in the organic product?

    • Alcohol

    • Aldehyde 

    • Carboxylic acid 

    • Ketone

    Choose your answer

    4
    1 mark

    Which compound is not produced when pentan-1-ol is oxidised by acidified potassium dichromate(VI)?

    • Pentanal

    • Pentan-2-one

    • Pentanoic acid

    • Carbon dioxide

    Choose your answer

    5
    1 mark

    How many structural isomers of C5H12O are primary alcohols?

    • 2

    • 3

    • 4

    • 5

    Choose your answer

    6
    1 mark

    2-Methylbutan-2-ol is heated to form compound A.

    Compound A, CH3C(CH3)=CH2CH3

    Which acid catalyst is required for this elimination reaction?

    • Al2O3 

    • Aqueous NaOH

    • Concentrated HCl 

    • Concentrated H3PO4

    Choose your answer

    7
    1 mark

    Which alcohol reacts with an acid catalyst to form E and Z stereoisomers?

    • 2,2-dimethylpropan-1-ol

    • 2-methylpropan-2-ol

    • Butan-1-ol

    • Butan-2-ol 

    Choose your answer

    8
    1 mark

    What are the correct reagents for the following conversion?

    CH3CH2CH2CH2OH → CH3CH2CH2CH2Cl

    • Cl2

    • Cl2 and H2SO4

    • KCl and aqueous NaOH

    • NaCl and H2SO4

    Choose your answer

    9
    1 mark

    Which sequence of reactions will synthesise 2-bromopropane from propan-1-ol?

    converting-propan-1-ol-into-2-bromopropane

    • Br2 and UV radiation

    • NaBr and H2SO4

    • Concentrated H2SO4 and heat, followed by Br2 and UV radiation

    • Concentrated H2SO4 and heat, followed by HBr

    Choose your answer

    10
    1 mark

    Which is the correct equation to show the oxidation of butan-1-ol using K2Cr2O7 / H+ under distillation?

    • CH3CH2CH2CH2OH + [O] → CH3CH2COCH3 + H2O

    • CH3CH2CH2CH2OH + [O] → CH3CH2CH2CHO + H2O

    • CH3CH2CH2CH2OH + 2[O] → CH3CH2CH2CHO + H2O

    • CH3CH2CH2CH2OH + 2[O] → CH3CH2CH2COOH + H2O

    Choose your answer

    11
    1 mark

    Compound X, C4H10O, is heated under reflux with acidified potassium dichromate(VI) to form organic product Y.

    Product Y gives an orange precipitate with 2,4-dinitrophenylhydrazine but does not react with Tollens' reagent.

    Which compound could be X?

    • Butan-1-ol

    • Butan-2-ol

    • 2-methylpropan-1-ol

    • 2-methylpropan-2-ol

    Choose your answer

    1
    1 mark

    Which alcohol reacts with an acid catalyst to form E and Z stereoisomers?

    • Pentan-3-ol

    • Pentan-1-ol

    • 2-methylbutan-2-ol

    • 2,2-dimethylpropan-1-ol

    Choose your answer

    2
    1 mark

    There are four alcohols with a molecular formula of C4H10O.

    • W is the major product formed from the hydration of but-1-ene.

    • X is the minor product formed from the hydration of but-1-ene.

    • Y does not react with acidified potassium dichromate.

    • Z has a lower boiling point than W and X.

    What are the identities of W, X, Y and Z respectively?

    • 2-methylpropan-2-ol, 2-methylpropan-1-ol, butan-2-ol, butan-1-ol

    • butan-2-ol, butan-1-ol, 2-methylpropan-2-ol, 2-methylpropan-1-ol

    • 2-methylpropan-1-ol, butan-2-ol, 2-methylpropan-2-ol, butan-1-ol

    • butan-2-ol, butan-1-ol, 2-methylpropan-1-ol, 2-methylpropan-2-ol

    Choose your answer

    3
    1 mark

    Propan-1-ol is heated under reflux with acidified potassium dichromate(VI).

    Which statement is correct?

    • A stopper must be used at the top of the condenser to ensure no product is lost.

    • Anti-bumping granules are added to the flask to make the mixture boil more vigorously.

    • Aqueous sodium carbonate can be used to distinguish the product from the reactant.

    • Water must flow into the top of the condenser and out at the bottom.

    Choose your answer

    4
    1 mark

    Which statement(s) about pentan-2-ol, pent-1-ene and butan-2-ol is/are correct?

    1. Complete combustion of 1 mol of pentan-2-ol and 1 mol of pent-1-ene requires the same number of moles of oxygen.

    2. The boiling points increase in the order: pent-1-ene, butan-2-ol, pentan-2-ol.

    3. The solubility in water increases in the order: pentan-2-ol, butan-2-ol, pent-1-ene.

    • 1, 2 and 3

    • Only 1 and 2

    • Only 2 and 3

    • Only 1

    Choose your answer

    5
    1 mark

    Which statement(s) about pent-3-en-1-ol is/are correct?

    1. Heating with concentrated sulfuric acid produces penta-1,3-diene.

    2. The organic product from heating with concentrated sulfuric acid shows E/Z isomerism in two places.

    3. Reaction with excess hydrogen bromide produces 1-bromopent-3-ene.

    • 1, 2 and 3

    • Only 1 and 2

    • Only 2 and 3

    • Only 1

    Choose your answer