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

12th Standard

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Chemistry

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

    Multiple Choice Questions

    15 x 1 = 15
  1. Aniline + benzoylchloride \(\overset { NaOH }{ \longrightarrow } \)C6H5 - NH - COC6 H5 this reaction is known as

    (a)

    Friedel – crafts reaction

    (b)

    HVZ reaction

    (c)

    Schotten – Baumann reaction

    (d)

    none of these

  2. When aniline reacts with acetic anhydride the product formed is

    (a)

    o – aminoacetophenone

    (b)

    m-aminoacetophenone

    (c)

    p – aminoacetophenone

    (d)

    acetanilide

  3. (a)

    H3PO2 and H2O

    (b)

    H+/H2O

    (c)

    HgSO4/H2SO4

    (d)

    Cu2Cl2

  4. When  is reduced with Sn / HCl the pair of compounds formed are

    (a)

    Ethanol, hydrozylamine hydrochloride

    (b)

    Ethanol, ammonium hydroxide

    (c)

    Ethanol, .NH2OH

    (d)

    C3H5NH2, H2O

  5. Among the following, the reaction that proceeds through an electrophilic substitution, is :

    (a)

    (b)

    (c)

    (d)

  6. (CH3)2 - CH - NO when boiled with HCI/H2O gives compound 'X'. Identify 'X'.

    (a)

    CH3COOH

    (b)

    (CH3)2C = 0

    (c)

    CH3CHO

    (d)

    CH3NO2

  7. The gas leaked from storage tank of the union Carbide plant in Bhopal gas tragedy was

    (a)

    Phosgene

    (b)

    methyl isocyanide

    (c)

    methyl isocyanate

    (d)

    methyl isothiocyanide

  8. Identify the amide which will not undergo Hofmann bromamide reaction

    (a)

    CH3CONHCH3

    (b)

    CH3CH2CONH2

    (c)

    CH3CONH2

    (d)

    both CH3CH2CONH2 and CH3CONH2

  9. In nitro alkanes -NO2 group is converted to - NH2 group by the reaction with

    (a)

    Sn/HCI

    (b)

    Zn dust

    (c)

    Zn/NH4CI

    (d)

    Zn/NaOH

  10. The reduction of CH3 - CH2 - C ☰ N with sodium and alcohol results in the formation of

    (a)

    \({ CH }_{ 3 }-\underset { \overset { | }{ { NH }_{ 2 } } }{ CH } -{ CH }_{ 3 }\)

    (b)

    CH3- CH2- CH2- OH + N2

    (c)

    CH3 - CH2 - CH2 - NH2

    (d)

    CH3 - CH2 - NH2

  11. Aniline differs from ethylamine by the reaction with

    (a)

    metallic sodium

    (b)

    an alkyl halide

    (c)

    chloroform and caustic potash

    (d)

    nitrous acid

  12. An organic compound 'A' with molecular formula C3H9N neither give nitrogen nor yellow oily liquid with HNO2 Then A is

    (a)

    CH3CH2-CH2-NH2

    (b)

    CH3CH2-CH2-NH2

    (c)

    \({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ N } -{ CH }_{ 3 }\)

    (d)

    All of these

  13. Amine that cannot be prepared by Gabriel Phthalimide synthesis is ___________

    (a)

    benzyl amine

    (b)

    methyl amine

    (c)

    ethyl amine

    (d)

    phenyl amine

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

    (a)

    acid medium

    (b)

    basic medium

    (c)

    electrolytic reduction

    (d)

    neutral medium

  15. Sandmeyer's reaction occurs in the presence of _________ and __________

    (a)

    cuprous halide and halo acid

    (b)

    cupric halide and halogen

    (c)

    copper - zinc couple and H2

    (d)

    none of these

  16. 2 Marks

    10 x 2 = 20
  17. Nitrobenzene does not undergo Friedel Crafts reaction - Give reason.

  18. Write about the functional isomerism of nitro methane?

  19. How will you convert benzene to m-dinitro benzene?

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

  21. Explain why aniline is less basic than methylamine?

  22. When benzamide is treated with bromine and alkali gives compound A. Also when benzamide is reduced by LiAlH4, compound B is formed. Find A and B. Write the equations.

  23. Identify (A), (B) and (C)
    \({ CH }_{ 4 }\xrightarrow [ { 400 }^{ o }C ]{ { HNO }_{ 3 } } A\underrightarrow { Sn/HCl } B\xrightarrow [ { HgCl }_{ 2 } ]{ { CS }_{ 3 } } C\)

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

  25. \({ C }_{ 2 }{ H }_{ 3 }N\xrightarrow [ Ether ]{ LiAl/{ H }_{ 4 } } B\underrightarrow { HN{ O }_{ 2 } } \) Identify A, Band C

  26. Bring about the conversion of Chlorobenzene to aniline

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

  31. Identify A,B,C and D 
    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

  32. How will convert nitrobenzene to benzoic acid?

  33. Write a note on the basicity of amines

  34. Explain Levine and hauser acetylation.

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

  36. Write a note on structure of amine.

  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. Account for the following:
    i) (CH3)2 NH is stronger base than NH3
    ii) CH3CH2NH2 is more basic than CH3CONH2
    iii) Aniline is less basic than Ethyl amine
    iv) On sulphonation of aniline, p-amino benzene sulphonic acid is formed.

  40. What happens when ethylamine is treated with
    (i) CHCl3/NaOH
    (ii) CS2
    (iii) C6H5CHO.

  41. Account for the following:
    (i) Nitroethane is soluble NaOH
    (ii) Nitroethane reacts with nitrous acid
    (iii) 2-methyl-2-nitro propane has neither of the properties.

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

  43. Write the differences between nitro methane and nitro benzene

  44. Write a note on
    (i) Carbylamine reaction
    (ii) Mustard oil reaction
    (iii) Acetylation of benzylamine
    (iv) Formation of Schiff's base
    (v) Diazotisation reaction

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

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