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

Nitrogen Compounds (OCR A Level Chemistry)

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6.4 Nitrogen Compounds

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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

    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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      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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