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12th Standard Chemistry English Medium Organic Nitrogen Compounds Reduced Syllabus Important Questions 2021

12th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 100

    Multiple Choice Questions

    15 x 1 = 15
  1. Which one of the following will not undergo Hofmann bromamide reaction

    (a)

    CH3CONHCH3

    (b)

    CH3 CH2CONH2

    (c)

    CH3CONH2

    (d)

    C6H5CONH2

  2. The product formed by the reaction an aldehyde with a primary amine

    (a)

    carboxylic acid

    (b)

    aromatic acid

    (c)

    schiff ’s base

    (d)

    ketone

  3. The order of basic strength for methyl substituted amines in aqueous solution is

    (a)

    N(CH3)3> N(CH3)2H> N(CH3)H2> NH3

    (b)

    N(CH3)H2>N(CH3)2H > N(CH3)3>NH3

    (c)

    NH3> N(CH3)H2> N(CH3)2 H>N(CH3)3

    (d)

    N(CH3)2H>N(CH3)H2> N(CH3)3> NH3

  4. C6H5NO2 \(\overset { Fe/Hel }{ \longrightarrow } A\overset { { NaNO }_{ 2 }/HCl }{ \underset { 273K }{ \longrightarrow } } B\overset { { H }_{ 2 }O }{ \underset { 283 }{ \longrightarrow } } C\quad 'C'is\)

    (a)

    C6H5- OH

    (b)

    C6H5-CH2OH

    (c)

    C6H5- COH

    (d)

    C6H5NH2

  5. Ammonium salt of benzoic acid is heated strongly with and the product so formed is reduced and then treated with NaNO2 / HCl at low temperature. The final compound formed is

    (a)

    Benzene diazonium chloride

    (b)

    Benzyl alcohol

    (c)

    Phenol

    (d)

    Nitrosobenzene

  6. Electrolytic reduction of nitrobenzene in strongly acidic medium gives

    (a)

    aniline

    (b)

    p - aminophenol

    (c)

    m-nitroaniline

    (d)

    azoxybenzene

  7. Positive carbylamine test is not shown by?

    (a)

    methyl amine

    (b)

    aniline

    (c)

    N -ethyl aniline

    (d)

    triethyl amine

  8. Which of the following compounds has the smell of bitter almonds?

    (a)

    aniline

    (b)

    nitro methane

    (c)

    benzene sulphonic acid

    (d)

    nitrobenzene

  9. Which one of the following is a secondary amine?

    (a)

    aniline

    (b)

    diphenyl amine

    (c)

    see.butylamine

    (d)

    tert.butylamine

  10. C6H5NH\(\underrightarrow { { NANO }_{ 2 }/HCl } \)  X Identify X.

    (a)

    C6H5CI

    (b)

    C6H5NHOH

    (c)

    C6H5N2CI

    (d)

    C6H5OH

  11. The IUPAC name of \({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -{ CH }_{ 2 }{ NH }_{ 2 }\) 

    (a)

    isobutyl amine

    (b)

    1-amino- 2-methyl propane

    (c)

    1-methyl-2-amino propane

    (d)

    2-amino-3-methyl butane

  12. The major product obtained when aniline is treated with acetic anhydride in the presence of pyridine is ____________

    (a)

    p bromo acetanilide

    (b)

    p - bromo aniline

    (c)

    acetanilide

    (d)

    2,4,6 tribromo aniline

  13. p-amino phenol is the product of reducing nitrobenzene in _________

    (a)

    acid medium

    (b)

    basic medium

    (c)

    electrolytic reduction

    (d)

    neutral medium

  14. The compound that does not show tautomerism is ____________

    (a)

    nitrobenzene

    (b)

    nitromethane

    (c)

    nitroethane

    (d)

    2-nitropropane

  15. Oxidation of aniline with acidified K2Cr2O7 gives ___________

    (a)

    p-benzoquinone

    (b)

    benzoic acid

    (c)

    benzaldehyde

    (d)

    benzyl alcohol

  16. 2 Marks

    10 x 2 = 20
  17. 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

  18. What are amines? How are they classified?

  19. Write the name and structure of four isomeric amines having the molecular formula C3H9N

  20. What·happens when aniline is treated with bromine?

  21. Explain why amines are more basic than amides.

  22. \({ C }_{ 6 }{ H }_{ 5 }CON{ H }_{ 2 }\xrightarrow [ KOH ]{ { Br }_{ 2 } } X\xrightarrow [ HCl ]{ { HNO }_{ 2 } } Y\xrightarrow [ { Cu }^{ + } ]{ { NaNO }_{ 2 } } Z\)
    Identify X,Y and Z.

  23. Write a note on Libermann's nitroso test.

  24. How is prepared from N-alkyl formamide?

  25. Write a note on addition reactions of alkyl isocyanides.

  26. Give any two uses of nitrobenzene.

  27. 3 Marks

    10 x 3 = 30
  28. How will you distinguish between primary secondary and tertiary alphatic amines.

  29. Arrange the following
    i. In increasing order of solubility in water, C6H5 NH2,(C2H5)2 NH,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) NH and CH3NH2
    vi. Increasing order of basic strength
    C2H5NH2,C6H5NH(CH3)2 ,(C2H5)2 NH and CH3NH2
    vii. In decreasing order of basic strength

  30. How are nitro alkanes prepared for the following
    i) alkyl bromides
    ii) methane

  31. How will convert nitrobenzene to benzoic acid?

  32. Write a note on the basicity of amines

  33. Explain Levine and hauser acetylation.

  34. Aniline reacts with Br2/H2O to give a tribromo derivative. How would you convert aniline to get a monobromo derivate?

  35. Convert aniline to p-nitro aniline

  36. Starting from the following reagents, how will your prepare ethanenitrile.
    i) CH3Br
    ii) CH3CONH2
    iii) CH3CH=NOH

  37. An organic compound 'A' on reduction gives compound 'B' which on reaction with trichloromethane and caustic potash forms 'C'. Compound 'C' on catalytic reduction given N-methyl benzenamine. Identify A, B and C and write the reactions involved.

  38. 5 Marks

    7 x 5 = 35
  39. Indentify A,B,C and D
    aniline+benzaldehyde \(\longrightarrow \) A 

  40. Write a note on the 'reduction of nitro benzene under different conditions.

  41. Accuount for
    i) Reduction of CH3CH gives CH3CH2NHwhile CH3NC gives (CH3)2NH.
    ii) (CH3)2NH requires two molar proportion of CH3I to give the same crystalline product formed by (CH3)2N with one mole of CH3l.
    iii) Nitration of aniline with conc.HNO3 may end up with same meta nitro product.
    iv) p-toluidine is a stronger base than p-nitroaniline.

  42. How can the following coversion be effected?
    i) Nitrobenzene ⇾ Nitrosobenzene
    ii) Nitrobenzene ⇾ Azoxybenzene
    iii) Nitrobenzene ⇾ Hydrazobenzene

  43. How do primary, secondary and tertiary amines react with nitrous acid?

  44. Outline the mechanism of
    (a) Nitration of aniline,
    (b) Acetylation of aniline.

  45. Cu SO4 on mixing with NH3 (1:4 ratio) does not give test for Cu2+ ions but gives test for SO42- ions. Why?

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