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Lassaigne's test for the detection of ni...

Lassaigne's test for the detection of nitrogen fails in which of the following

A

`H_2N- CO0 NHNH_2. HCL`

B

`NH_2-NH_2.HCL`

C

`NH_4-CO-NH_2`

D

`C_6H_5- NH- NH_4.HCl`

Text Solution

Verified by Experts

The correct Answer is:
B
Lassaigne.s test is given by those nitrogenous compounds in which carbonin also present alongwith nitrogen.
IN `NH_2.NH_2.HCl` carbon is absent, so it does not give Lassaigne.s test.
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Knowledge Check

  • Lassaigne's test fails in

    A
    `NH_2NH_2`
    B
    `H_2NCONH_2`
    C
    `C_6H_2NHNH_2`
    D
    `NH_2OH`

  • In Lassaigne's test for the detection of halogens, the sodium fusion extract is first bioled with concentrated nitric acid. This is

    A
    to remove silver halides
    B
    to decompose `Na_(2)S` and `NaCN`, if present
    C
    to dissolve `Ag_(2)S`
    D
    to dissolve AgCN, if formed

  • 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 elements like N, S, P, and halogens are detected by their usual tests. Black precipitate in the detection of sulphur with lead acetate and acetic acid is due to the formation of:

    A
    `Pb_2S`
    B
    PbS
    C
    `PbS_2`
    D
    `PbSO_4`

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