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A LevelChemistryOCRExam Questions6. Organic Chemistry & AnalysisNitrogen Compounds

Nitrogen Compounds (OCR A Level Chemistry A): Exam Questions

Exam code: H432

2 hours30 questions

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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

 

    Choose your answer

    21 mark

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

    • amino-acid-a

       

    • amino-acid-b

       

    • compound-c

       

    • amino-acid-d

       

    Choose your answer

    31 mark

    What is the correct name of the following amine? 

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

    • Triethylamine

    • Trimethylamine

    • Diethylamine

    • N-methylethylamine

    Choose your answer

    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

    Choose your answer

    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 

    Choose your answer

    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

    Choose your answer

    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

    Choose your answer

    31 mark

    What is the IUPAC name for the following amine? 

    1-16

    • N-propylmethylamine

    • Butylamine

    • 2-aminobutane

    • N-methylpropylamine

    Choose your answer

    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

    Choose your answer

    51 mark

    The structure of the amino acid lysine is shown below:

    1-17

    What species is present at a low pH?

    Lysine options

      Choose your answer

      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

      Choose your answer

      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.

      Choose your answer

      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

      Choose your answer

      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.

      Choose your answer

      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

      Choose your answer