Amines

Short Answer Type

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Account for the following:
Gabriel phthalimide synthesis is preferred for the synthesizing amines.

Gabriel phthalimide synthesis results in the formation of primary amine only. secondary or tertiary amines are not formed in this synthesis. thus, the pure primary amine can be obtained. Therefore, Gabriel phthalimide synthesis is preferred for synthesising primary amines.

Phthalimide is alkylated with alkyl or benzyl halide and then hydrolysed or hydrazinolysis to get pure primary amine. In this method, phthalic acid is produced which can be again converted into phthalimide and used over and over again.
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    Arrange the following:
    In decreasing order of the pKb values C2H5NH2, C6H5 NHCH3, (C2H5)2NH and C6H5NH2.

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

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

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    Account for the following:
    Diazonium ions of aromatic amines are more stable than those of aliphatic amines.
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    Account for the following:
    pKb of aniline is more than that of methylamine.

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

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

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    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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    Account for the following:
    Aniline does not undergo Friedel Craft's reaction.
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