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Lassigne's test in not shown by diazoniu...

Lassigne's test in not shown by diazonium salts and hydrazines `(NH_2NH_2)`. Why?

Text Solution

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Diazonium salts usually lose `N_2` on heating much before they react with fused NA metal. That is why they do not give the above test.
Hydrazine does ot have C atoms so it does not form `NaCN` and hence does not give a positive test for `N`. In ordeer to test the presence of N in such compounds, during fusion with `Na`, some chacoal or preferably starch (which contains C but not N, S, halohgens ets. ) is added under these conditions, C of starch or charcoal combines with N of the compound to form `NaCN` which will give a positive test for N.
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Lassaigne's test is not shown by diazonium salts. Why ?

Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices. Assertion : Lassaigne's test is not shown by diazonium salts. Reason : Diazonium salts lose N_2 on heating much before than they have a chance to react with fused sodium.

Knowledge Check

  • Assertion : Lassaigne's test is not shown by diazonium salts. Reason : Diazonium salts lose N_(2) on heating much before they have a chance to react with fused sodium. Reason : Molecular weight is twice density.

    A
    If both assertion and Reason are true, and reason is the true explanation of the assertion.
    B
    If both assertion and reason are true, but reason is not the true explanation of the assertion.
    C
    If assertion is true, but reason is false
    D
    If both assertion and reason are false

  • (A) Lassaigne's test is not shown by diazonium compounds. (R) Diazonium compounds lose N_(2) on heating

    A
    If both assertion and reason are correct and reason is the correct explanation of the assertion
    B
    If both assertion and reason are correct but reason is not the correct explanation of the assertion
    C
    If assertion is correct but reason is incorrect
    D
    If assertion is incorrect but reason is correct

  • Sandmeyer's reaction of diazonium salts is a replacement reaction of N_2 by

    A
    Halides
    B
    Hydroxyl group
    C
    Hydrogen
    D
    Azides

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    Lassaigne's test is not very successful for diazonium salts. Assign reason.

    Aromatic diazonium salts are more stable than aliphatic diazonium salts. Why ? Such a charge delocalisation is not possible in aliphatic diazonium salts and hence they are less stable than aromatic diazonium salts.

    Calcualte the percentage hydrolysis of 10^(-3)M N_(2)^(o+)H_(5)C1^(Theta) (hydrazinium chloride), salt contining acid ion conjugate to hydrazine base (NH_(2)NH_(2)). K_(b) for N_(2)H_(4) = 1.0 xx 10^(-6) .

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