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Organic Nitrogen Compounds

12th Chemistry - Organic Nitrogen Compounds Model Question Paper

Organic Nitrogen Compounds Model Question Paper

12th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 45
    8 x 1 = 8

  1. The method by which aniline cannot be prepared is _________.

    (a)

    degradation of benzamide with Br2 / NaOH

    (b)

    potassium salt of phthalimide treated with chlorobenzene followed by hydrolysis with aqueous NaOH solution.

    (c)

    reduction of Nitrobenzene with LiAlH4

    (d)

    reduction of nitrobenzene by Sn / HCl

  2. 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

  3. Identify X in the sequence give below

    (a)

    (b)

    (c)

    (d)


  4. The above structure represents

    (a)

    Vitamin B12

    (b)

    Vitamine B6

    (c)

    dopamine

    (d)

    Histamine

  5. Electrolytic reduction of nitrobenzene in strongly acidic medium gives

    (a)

    aniline

    (b)

    p - aminophenol

    (c)

    m-nitroaniline

    (d)

    azoxybenzene

  6. When nitro methane condenses with acetone it gives

    (a)

    1-nitro-2-propanol

    (b)

    1-nitro-2-methoxy propane

    (c)

    1-nitro-2-methoxy-ethanol

    (d)

    1-nitro-2-methoxy-propanol

  7. Conversion of benzene diazonium chloride to chlorobenzene is called ________

    (a)

    Sandmeyer's reaction

    (b)

    Stephen's reaction

    (c)

    Gomberg reaction

    (d)

    Schotten-Baumann reaction

  8. \({ CH }_{ 3 }-\overset { \underset { || }{ O } }{ C } -{ NH }_{ 2 }+4(H)\xrightarrow [ Ethanol ]{ Na } \) The compound is ________

    (a)

    Methylamine

    (b)

    Ethylamine

    (c)

    Dimethylamine

    (d)

    Nitro-methane

    9. 1 x 2 = 2

  9. Assertion: Aniline couples with NaNO/ HCI to give β-Naphthol which is a blue colour precipitate.
    Reason The colour of the compound is due to conjugation of the ring.
    Codes:
    a) (A) and (R) are true and (R) is the correct explanation of (A)
    b) Both (A) and (R) are true but (R) does not explain (A)
    c) (A) is true but (R) is false
    d) Both (A) and (R) are false

    10. 1 x 2 = 2

  10. Which among the following is the Incorrect statement regarding the acidic nature of nitroalkanes?
    a) 10 and 20 nitroalkanes show acidic character
    b) nitroalkane dissolve in NaOH to give salt
    c) aci form is more acidic than intro form
    d) acidity decreases due to the - I effect of alkyl groups

    11. 7 x 2 = 14

  11. There are two isomers with the formula  CH3NO2. How will you distinguish between them?

  12. 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

  13. Define tautomerism.

  14. What is chloropicrin?

  15. 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.

  16. Can aniline be prepared by Gabriel phthalimide reaction? Justify your answer.

  17. How is fluorobenzene prepared from benzenediazonium chloride? Name the reaction.

    18. 3 x 3 = 9

  18. 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

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

  20. Outline the preparation of (a) para nitroaniline from aniline, (b) tri bromo benzene from tribromo aniline

    21. 2 x 5 = 10

  21. Predict A,B,C and D for the following reaction

  22. 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.

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