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Qualitative analysis of organic compound...

Qualitative analysis of organic compounds is performed by Lassaigne's test by fusion with metallic sodium, by which the covalent compounds are converted into ionic compounds. Extra elementsline `N,S,P` andhalogensaredetected by their usual tests.
Q. Which of the following compounds will give positive lassaigne's test for nitrogen

A

`NH_2OH`

B

`NH_2NH_2`

C

`KCN`

D

Text Solution

Verified by Experts

The correct Answer is:
C
Positive lassaigne's test is given by the compound which containsboth C andN. Moreover, this test is not given by diazonium compounds because they lose `N_2` on heating much before they react with `Na` hence the answer is (c).
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Knowledge Check

  • Qualitative analysis of organic compounds is performed by Lassaigne's test by fusion with metallic sodium, by which the covalent compounds are converted into ionic compounds. Extra elementsline N,S,P andhalogensaredetected by their usual tests. Q. Which of the following will give blood-red colour in lassaigne's test for nitrogen

    A
    `PhNH_2`
    B
    `PhNO_2`
    C
    D
    `PhSO_3H`

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    A
    RX(X=Cl,Br,I)`
    B
    Urea
    C
    Thiourea
    D
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  • Which of the following compounds will give negative Lassaigne is test for Nitrogen?

    A
    B
    C
    D
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