Account for the following:Methylamine in water reacts with ferri
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    Amines

    Multiple Choice QuestionsShort Answer Type

    201.

    Give one chemical test to distinguish between the following pairs of compounds.
    Aniline and N — methlyaniline.

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    202.

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

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    203.

    Account for the following:
    Ethylamine is soluble in water, whereas aniline is not.

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    204.

    Account for the following:
    Methylamine in water reacts with ferric chloride to precipitate ferric hydroxide.

     

    Due to the +I effect of -CH3 group, methylamine is more basic than water. therefore, in water methylamine produces OH- ions by accepting H+ ions form water.

    Methyl amine is a base and dissolves in water to produce hydroxide ions.
    CH3 NH2 + H2O ⇌ CH3 NH3⊕ + OHΘ
    FeCl3 combines with OH- ions to give reddish brown precipitate of Fe (OH)3

    FeCl3 + 3OH- → Fe(OH)3

     

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    205. Account for the following:
    Although amino group is o- and p-directing for aromatic electrophilic substitution reaction, aniline on nitration gives a substantial amount of m-nitro aniline.
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    206. Account for the following:
    Aniline does not undergo Friedel Craft's reaction.
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    207. Account for the following:
    Diazonium ions of aromatic amines are more stable than those of aliphatic amines.
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    208. Account for the following:
    Gabriel phthalimide synthesis is preferred for the synthesizing amines.
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    209.

    Arrange the following:
    In decreasing order of the pKb values C2H5NH2, C6H5 NHCH3, (C2H5)2NH and C6H5NH2.

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    210.

    Arrange the following:
    In decreasing order of basic strength:
    C    6H5NH2, C6HsN(CH3)2, (C2H5)2NH and CH3NH2

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