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A compound which does not give a positiv...

A compound which does not give a positive test in Lassaigne.s test for nitrogen is

A

Urea

B

Hydrazine

C

Azobenzene

D

Phenyl hydrazine

Text Solution

Verified by Experts

The correct Answer is:
B
Hydrazine.
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Knowledge Check

  • The compound which does not respond to iodoform test is

    A
    `CH_(3) - CHO`
    B
    `CH_(3)CH(OH)CH_(3)`
    C
    `C_(2)H_(5)-CO-C_(2)H_(5)`
    D
    `C_(6)H_(5)COCH_(3)`

  • An alcohol (A) on dehydration gives (B) which on ozonolysis gives two products C & D (D) gives positive iodoform test and on heating with dilute alkali gives alpha . beta -unsaturated carbonyl compound (E) which does not gives positive iodoform test. (C) on oxidation gives a mono basic acid (F) Ag salt of (F) contains 59.6% Ag. Oxime of (D) contains 16.09% nitrogen. the structure of (A) is

    A
    `CH_3(CH_2)_2 C(CH_3)(OH)CH_2 CH_3`
    B
    `CH_3CH_2 CH(OH) CH (CH_3)C_2 H_5`
    C
    `CH_3 CH_2 C (CH_3)(OH) CH_2 CH_3`
    D
    `CH_3CH_2 CH (OH) (CH _3)_2`

  • An alcohol (A) on dehydration gives (B) which on ozonolysis gives two products C & D (D) gives positive iodoform test and on heating with dilute alkali gives alpha . beta -unsaturated carbonyl compound (E) which does not gives positive iodoform test. (C) on oxidation gives a mono basic acid (F) Ag salt of (F) contains 59.6% Ag. Oxime of (D) contains 16.09% nitrogen. structure of D is

    A
    `CH_3 CH_2 COCH_3`
    B
    `(CH_3)_2 CO`
    C
    `CH_3 CH_2 CHO`
    D
    `(C_2H_5 )_2 CO`

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    An alcohol (A) on dehydration gives (B) which on ozonolysis gives two products C & D (D) gives positive iodoform test and on heating with dilute alkali gives alpha . beta -unsaturated carbonyl compound (E) which does not gives positive iodoform test. (C) on oxidation gives a mono basic acid (F) Ag salt of (F) contains 59.6% Ag. Oxime of (D) contains 16.09% nitrogen. the structure of (E ) is given reaction is

    For which of the following compounds the Lassaigne's test of nitrogen will fail?

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