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Organic Nitrogen Compounds 3 Mark Book Back Question Paper With Answer Key

12th Standard

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Chemistry

Time : 02:30:00 Hrs
Total Marks : 102

    3 Marks 

    34 x 3 = 102
  1. Identify compounds A, B and C in the following sequence of reactions.
    i) \({ C }_{ 6 }{ H }_{ 5 }NO_{ 2 }\overset { Fe/HCL }{ \longrightarrow } A\overset { HN{ O }_{ 2 } }{ \underset { 273K }{ \longrightarrow } } B\overset { { C }_{ 6 }{ H }_{ 5 }OH }{ \longrightarrow } C\)
    ii) \({ C }_{ 6 }{ H }_{ 5 }N_{ 2 }cl\overset { CuCN }{ \longrightarrow } A\overset { H_{ 2 }O/H^{ + } }{ \longrightarrow } B\overset { NH_3 }{ \longrightarrow } C\)
    iii) \({ C }{ H }_{ 3 }{ C }{ H }_{ 2 }I\overset { NaCN}{ \longrightarrow } A\overset {OH^-}{ \underset {Partial hydrolysis}{ \longrightarrow } } B\overset {NaOH+Br_2 }{ \longrightarrow } C\)
    iv) \({ C }{ H }_{ 3 }NH_{ 2 }\overset { CH_3 Br }{ \longrightarrow } A\overset { CH_{ 3 }COCl}{ \longrightarrow } B\overset { B_2H_6 }{ \longrightarrow } C\)
    v) \({ C }_{ 6 }{ H }_{ 5 }NH_{ 2 }\overset { (CH_{ 3 }CO)_{ 2 }O }{ \underset { Pyridine }{ \longrightarrow } } A\overset { HNO_{ 3 } }{ \underset { H_{ 2 }SO_{ 4 },288K }{ \longrightarrow } } B\overset { { H }_{ 2 }O/{ H }^{ + } }{ \longrightarrow C } \)
    vi) 

    vii) \({ C }{ H }_{ 3 }CN_{ 2 }NC\overset { HgO }{ \longrightarrow } A\overset { H_{ 2 }O }{ \longrightarrow } B\overset { i) NaN{ O }_{ 2 }/HCL }{ \underset { ii){ H }_{ 2 }O }{ \longrightarrow } } \)

  2. Write short notes on the following
    i. Hofmann’s bromide reaction
    ii. Ammonolysis
    iii. Gabriel phthalimide synthesis
    iv. Schotten – Baumann reaction
    v. Carbylamine reaction
    vi. Mustard oil reaction
    vii. Coupling reaction
    viii. Diazotisation
    ix. Gomberg reaction

  3. Account for the following
    i. Aniline does not undergo Friedel – Crafts reaction
    ii. Diazonium salts of aromatic amines are more stable than those of aliphatic amines
    iii. pKb of aniline is more than that of methylamine
    iv. Gabriel phthalimide synthesis is preferred for synthesising primary amines.
    v. Ethylamine is soluble in water whereas aniline is not
    vi. Amines are more basic than amides
    vii.Although amino group is o – and p – directing in aromatic electrophilic substitution reactions, aniline on nitration gives a substantial amount of m – nitroaniline.

  4. How will you convert diethylamine into
    i) N, N – diethylacetamide
    ii) N – nitrosodiethylamine

  5. Identify A,B and C
    \(\overset{SOCl_2}\longrightarrow A \overset{NH_3}\longrightarrow B\overset{LiAlH_4}\longrightarrow (C)\)

  6. Arrange the following
    i. In increasing order of solubility in water, C6H5 NH2, (C2H5)2NH, C2H5NH2
    ii. In increasing order of basic strength
    a) aniline, p- toludine and p – nitroaniline
    b) C6H5 NH2, C6H5 NHCH3, C6H5NH2, p-Cl-C6- H4-NH2
    iii. In decreasing order of basic strength in gas phase
    (C2H5)NH2, (C2H5)NH, (C2H5)5N and NH3
    iv. In increasing order of boiling point
    C6H5OH, (CH3)2NH, C2H5NH2
    v. In decreasing order of the pKb values
    C2H5NH2, C6H5NHCH3.(C2H5)2 NH and CH3NH2
    vi. Increasing order of basic strength
    C2H5NH2,C6H5N(CH3)2, (C2H5)2 NH and CH3NH2
    vii. In decreasing order of basic strength

  7. How will you prepare propan – 1- amine from
    i) butane nitrile
    ii) propanamide
    ii) 1- nitropropane

  8. Identify A,B,and C
    CH3- NO2 \(\overset { { L }_{ 1 }{AlH }_{ 4 } }{ \underset { {} }{ \longrightarrow } }\) A  \(\overset { { 2CH_3 }{Ch_2Br } }{ \underset { {} }{ \longrightarrow } }\) B \(\overset { {H}_{ 2 }{SO}_{ 4 } }{ \underset { {} }{ \longrightarrow } } \) C

  9. Identify compounds A, B and C in the following sequence of reactions.
    ii) \({ C }_{ 6 }{ H }_{ 5 }N_{ 2 }cl\overset { CuCN }{ \longrightarrow } A\overset { H_{ 2 }O/H^{ + } }{ \longrightarrow } B\overset { NH_3 }{ \longrightarrow } C\)

  10. Identify compounds A, B and C in the following sequence of reactions.
    iii) \({ C }{ H }_{ 3 }{ C }{ H }_{ 2 }I\overset { NaCN}{ \longrightarrow } A\overset {OH^-}{ \underset {Partial hydrolysis}{ \longrightarrow } } B\overset {NaOH+Br_2 }{ \longrightarrow } C\)

  11. Identify compounds A, B and C in the following sequence of reactions.
    iv) \({ C }{ H }_{ 3 }NH_{ 2 }\overset { CH_3 Br }{ \longrightarrow } A\overset { CH_{ 3 }COCl}{ \longrightarrow } B\overset { B_2H_6 }{ \longrightarrow } C\)

  12. Identify compounds A, B and C in the following sequence of reactions.
    v) \({ C }_{ 6 }{ H }_{ 5 }NH_{ 2 }\overset { (CH_{ 3 }CO)_{ 2 }O }{ \underset { Pyridine }{ \longrightarrow } } A\overset { HNO_{ 3 } }{ \underset { H_{ 2 }SO_{ 4 },288K }{ \longrightarrow } } B\overset { { H }_{ 2 }O/{ H }^{ + } }{ \longrightarrow C } \)

  13. Identify compounds A, B and C in the following sequence of reactions.
    vi) 

  14. Identify compounds A, B and C in the following sequence of reactions.
    vii) \({ C }{ H }_{ 3 }CN_{ 2 }NC\overset { HgO }{ \longrightarrow } A\overset { H_{ 2 }O }{ \longrightarrow } B\overset { i) NaN{ O }_{ 2 }/HCL }{ \underset { ii){ H }_{ 2 }O }{ \longrightarrow } } \)

  15. Write short notes on the following
    ii. Ammonolysis

  16. Write short notes on the following
    iii. Gabriel phthalimide synthesis

  17. Write short notes on the following
    iv. Schotten – Baumann reaction

  18. Write short notes on the following
    v. Carbylamine reaction

  19. Write short notes on the following
    vi. Mustard oil reaction

  20. Write short notes on the following
    vii. Coupling reaction

  21. Write short notes on the following
    viii. Diazotisation

  22. Write short notes on the following
    ix. Gomberg reaction

  23. Account for the following
    ii. Diazonium salts of aromatic amines are more stable than those of aliphatic amines

  24. Account for the following
    iii. pKb of aniline is more than that of methylamine

  25. Account for the following
    iv. Gabriel phthalimide synthesis is preferred for synthesising primary amines.

  26. Account for the following
    v. Ethylamine is soluble in water whereas aniline is not

  27. Account for the following
    vi. Amines are more basic than amides

  28. Account for the following
    vii. Although amino group is o – and p – directing in aromatic electrophilic substitution reactions, aniline on nitration gives a substantial amount of m – nitroaniline.

  29. Arrange the following
    ii. In increasing order of basic strength
    a) aniline, p- toludine and p – nitroaniline
    b) C6H5 NH2, C6H5 NHCH3, C6H5NH2, p-Cl-C6- H4-NH2

  30. Arrange the following
    iii. In decreasing order of basic strength in gas phase
    (C2H5)NH2, (C2H5)NH, (C2H5)5N and NH3

  31. Arrange the following
    iv. In increasing order of boiling point
    C6H5OH, (CH3)2NH, C2H5NH2

  32. Arrange the following
    v. In decreasing order of the pKb values
    C2H5NH2, C6H5NHCH3.(C2H5)2 NH and CH3NH2

  33. Arrange the following
    vi. Increasing order of basic strength
    C2H5NH2,C6H5N(CH3)2, (C2H5)2 NH and CH3NH2

  34. Arrange the following
    vii. In decreasing order of basic strength

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