OCR A Level Chemistry

Topic Questions

A LevelChemistryOCRTopic Questions6. Organic Chemistry & Analysis (A Level Only)6.4 Nitrogen Compounds

6.4 Nitrogen Compounds

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11 mark

What are the correct set of reagents and conditions for the two conversions shown?

 

 C6H5NO2  →  C6H5NH2

CH3CH2CHClCH3  →  CH3CH2CH(NH2)CH3

A

 NaBH4 nitric acid / 50 °C

B

 NaBH4 nitric acid / <10 °C

C

 Sn / conc. H2SO4

dilute ethanolic NH3

D

 Sn / conc. HCl

excess ethanolic NH3

 

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21 mark

Which compound is an amino acid with the R group –CH2OH?

  • amino-acid-a 

  • amino-acid-b 

  • compound-c 

  • amino-acid-d 

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31 mark

What is the correct name of the following amine? 

7-5-e-q1-aqa-al-chemistry

  • Triethylamine

  • Trimethylamine

  • Diethylamine

  • N-methylethylamine

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41 mark

What are the correct reagents and conditions for the formation of propylamine, CH3CH2CH2NH2?

  • Excess 1-bromopropane and ammonia

  • 1-bromopropane and excess ammonia in a sealed tube

  • 2-bromopropane and excess ammonia in a sealed tube 

  • Excess 2-bromopropane and ammonia

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51 mark

Which two reactants are required for the formation of N-ethyl butanamide?

  • 1-chlorobutane and ammonia 

  • Ethanoic anhydride and butylamine

  • Ethanoyl chloride and butylamine

  • Butanoyl chloride and ethylamine 

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11 mark

Two amines are made from methylbenzene in the reactions below.

u2uj6KTj_ocr-a2-6-4h-mcq-q1-reaction-sequence

Which statement(s) is/are correct?

  1. The yield of amine X is greater than the yield of amine Y.
  2. Step 2 forms a protonated intermediate called 4-methylphenylammonium chloride.
  3. Using excess, hot aqueous ammonia step 4 will produce the primary amine Y.

  • 1, 2 and 3

  • Only 1 and 2

  • Only 2 and 3

  • Only 1

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21 mark

Four different versions of aspartic acid are shown below. pKa for the amine group is 9.6 and for the acid groups is less than 4.0.

 eTkE4W3W_ocr-a2-6-4h-mcq-q4-aspartic-acid

Which statement is correct?

  • Species W is formed when aspartic acid reacts with HCl. 

  • Species X is present in an aqueous solution of aspartic acid at pH 12.0. 

  • Species Y shows that aspartic acid is amphoteric.

  • Species Z will exist at pH 7.0.

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31 mark

Amine X is shown below.

~0tJpg9d_ocr-a2-6-4h-mcq-q2-amine-x

Which statement(s) is/are correct?

  1. Reacting amine X with water would cause universal indicator to turn blue.
  2. There are six isomers of amine X which are secondary amines.
  3. Amine X would produce five peaks on a 13C NMR spectrum.

  • 1, 2 and 3

  • Only 1 and 2

  • Only 2 and 3

  • Only 1

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41 mark

CH3CH2COCl reacts with a cold concentrated solution of CH3CH2NH2.

Which of the following is correct?

  • The reaction is an electrophilic addition-elimination.

  • The intermediate is negatively charged. 

  • The organic product formed is N-ethylpropanamide. 

  • Toxic white fumes of HCl are produced.

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51 mark

Which statement(s) about amines is/are correct?

  1. Making an amine via the reduction of a nitrile has a higher atom economy than nucleophilic substitution of a haloalkane with ammonia.
  2. 2-aminobutane cannot be formed from the reduction of a nitrile.
  3. CH3NH3Cl could be added to aqueous methylamine to produce a buffer solution.

  • 1, 2 and 3

  • Only 1 and 2

  • Only 2 and 3

  • Only 1

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11 mark

Which of the following reagents would be suitable for the reduction of nitrobenzene to produce phenylamine?

  • LiAlH4 in dry ether

  • NaBH4

  • Fe in presence of HCl

  • H2 in presence Mg catalyst

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21 mark

Which of the following explains why propylamine is a stronger base than phenylamine?

  • Electron density is pulled away from the nitrogen atom in propylamine

  • Alkyl groups are electron withdrawing groups

  • The lone pair on the nitrogen atom in phenylamine becomes delocalised into the benzene ring

  • The positive inductive effect is greater in phenylamine than propylamine

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31 mark

What is the IUPAC name for the following amine? 

1-16

  • N-propylmethylamine

  • Butylamine

  • 2-aminobutane

  • N-methylpropylamine

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41 mark

Which statement is correct if a large excess of ammonia reacts with chloroethane? 

  • The electrophilic substitution occurs

  • The formation of the quaternary ammonium salt is favoured

  • One mole of ammonia reacts with one mole of chloroethane to produce a primary amine

  • The formation of a primary amine is favoured

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51 mark

The structure of the amino acid lysine is shown below:1-17What species is present at a low pH?

Lysine options

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