AQA A Level Chemistry

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A LevelChemistryAQATopic Questions7. Advanced Organic Chemistry (A Level only)7.3 Carboxylic Acids & Derivatives (A-level only)

7.3 Carboxylic Acids & Derivatives (A-level only)

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11 mark

Methanoic acid reacts with propanol in the presence of a small amount of concentrated sulphuric acid.

What is the correct name for the ester formed?

  • Methyl propyl sulfate

  • Methyl propanoate

  • Propyl ethanoate

  • Propyl methanoate

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21 mark

What is the correct general formula for an acyl chloride?

  • CnH2n+1COCl 

  • CnH2n-1COCl 

  • CnH2nCOCl 

  • CnHn+1COCl 

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31 mark

Propanoic acid dissociates according to the following equation.

CH3CH2COOH (aq) ⇌ CH3CH2COO- (aq) + H+ (aq)

Which statement about propanoic acid is correct?

  • The equilibrium for the dissociation of propanoic acid lies to the right

  • Propanoic acid is a strong acid

  • Propanoic acid undergoes partial ionisation

  • The H+ ions released cause propanoic acid to have a high pH

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41 mark

Esters can be hydrolysed under acidic or alkaline conditions.

Which statement about the hydrolysis of esters is correct?

  • The alkaline hydrolysis of an ester is a reversible reaction

  • The acid hydrolysis of an ester uses sodium hydroxide under reflux

  • The alkaline hydrolysis of an ester produces the parent carboxylic acid and alcohol

  • The acid hydrolysis of an ester does not go to completion

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51 mark

Organic reactions can be completed by the use of acyl chlorides or acid anhydrides instead of carboxylic acids.

Which reason about the use of acyl chlorides and acid anhydrides is correct?

  • Acyl chlorides are safer and quicker to use than acid anhydrides

  • Acid anhydrides are less reactive than acyl chlorides

  • Acid anhydrides produce strong, corrosive acids as a byproduct of the reaction

  • Acyl chlorides are less expensive than acid anhydrides

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11 mark

The structure of Vitamin B6 is shown below:

7-3-h-q1-aqa-al-chemistry-mcq

Which one of the following is not a correct statement?

  • It produces a silver mirror with Tollens’ reagent

  • It is unsaturated

  • It has 6 peaks in the 13C NMR spectrum

  • It can be oxidised to a carboxylic acid

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21 mark

Which of the following pairs react together to produce CH3CH2CH2COOCH(CH3)2?

  • Propanoyl chloride and propan-2-ol

  • Propanoyl chloride and butan-2-ol

  • Butanoyl chloride and propan-1-ol

  • Butanoyl chloride and propan-2-ol

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31 mark

Biodiesel can be manufactured from triglyceride oils with which reagent and catalyst?

 

 

Reagent

Catalyst

A

HOCH2CH(OH)CH2OH

NaOH

B

H2O

H2SO4

C

CH3OH

H2SO4

D

CH3CH2OH

NaOH

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41 mark

The acylation of primary amines can be represented in the following equation:

 RCOCl + RNH2 → RCONHR + HCl

 Which combination of acyl chloride and amine produces an amide that gives four peaks in an 1H NMR spectrum with peaks splitting as doublet, triplet and two quartets?

  • CH3CH2COCl + CH3NH2

  • CH3COCl + CH3CH2NH2

  • CH3CH2CH2COCl + CH3NH2

  • CH3CH2COCl + CH3CH2NH2

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51 mark

Squaric acid is used in the treatment of warts. Its structure is shown below:

7-3-h-q5qa-al-chemistry-mcq

Which of the following statements is not true about squaric acid?

  • It reacts with bromine water to produce C4H2O4Br2

  • The conjugate base of squaric acid is C4HO4-

  • The bond angles found in the molecule are 90o and 120o

  • Squaric acid can form a bidentate ligand

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11 mark

The natural bacterial fermentation of milk produces a compound called propanoic acid.

Propanoic acid is partly responsible for the flavour of Swiss cheese. Its structure is shown below:

7-3-m-q1-mcq-al-chemistry

Which starting materials could be used to produce propanoic acid?

 

 

CH3CH2CN

CH3CH2CHO

CH3CH2CH2OH

A

✓

✓

✓

B

✓

✓

x

C

x

✓

✓

D

✓

x

x

 

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21 mark

The structure of the analgesic ibuprofen is shown below:

7-3-m-q2-mcq-al-chemistry

Which of the following is not a correct statement about ibuprofen?

  • It will react with alcohols to produce an ester

  • It will react with lithium aluminium hydride to produce an alcohol

  • It will react with sodium carbonate solution

  • It has geometric isomers

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31 mark

The structure of ester E is shown in the diagram below.

 7-3-m-q3-mcq-al-chemistry

E is hydrolysed in the presence of hydrochloric acid.

Which are the products of this hydrolysis?

 

 

Which are the products of this hydrolysis?

  • CH3CO2H and (CH3)2CHCH2CH2CHO

  • CH3CO2H and (CH3)2CHCH2CH2OH 

  • CH3COCl and (CH3)2CHCH2CH2OH 

  • CH3CHO and (CH3)2CHCH2CH2OH

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41 mark

The molecule CH3CH2CH2CO2CH2CH3 is used as a pineapple flavouring in sweets.

 

Which statements about this molecule are correct?

 

 

When heated with NaOH(aq), the products are butan-1-ol and sodium ethanoate

The name of this compound is ethyl butanoate

This compound is a structural isomer of hexanoic acid

A

✓

✓

✓

B

✓

✓

x

C

x

✓

✓

D

✓

x

x

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51 mark

Lactic acid is a naturally occurring molecule.

 7-3-m-q5-mcq-al-chemistry

                              

Which statement is true about lactic acid?

  • It rapidly decolourises aqueous bromine

  • Two molecules can react together in strong acid conditions

  • It reduces Fehling’s reagent

  • It is insoluble in water

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