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Which of the following organic compound ...

Which of the following organic compound will give red colour in Lassaigne's test?

A

`C_(6)H_(5)CN`

B

C

`NH_(2)-overset(O) overset(||)(C)-NH_(2)`

D

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The correct Answer is:
D
Compound containing sulphur along with nitrogen and sodium, present is in insufficient amount. But as sodium thiocyanate is formed, it gives red colouration by reaction with Ferrilc ions
`3NaSCN+Fe^(+3)to[Fe(SCN)_(3)]+3Na^(+)`
Blood red colour
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Here paragraphs are given. Based upon the paragraphs some multiple choice questions are given. Each question has 4 choices A, B, C and D. Out of which one is correct. Choose the correct option Paragraph/comprehension In the detection of elements by Lassaigne’s test, the covalent compounds are converted into ionic compounds on fusion with sodium metal. The nitrogen, sulphur and halides present in the organic compounds are test with their usual tests. In this test blue or green colour is obtained when only nitrogen is present whereas red colour is obtained when both nitrogen and sulphur are present. The Lassaigne’s extract is boiled with HNO_(3) so as to decompose Na_(2) and NaCN if present. Phosphorus is detected in the organic compound by fusing it with sodium peroxide. When sodium phosphate formed is detected with cone. HNO_(3) and ammonium molybdate. Which of the following will give blood red colour in Lassaigne's test for nitrogen

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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

NARAYNA-PRACTICAL ORGANIC CHEMISTRY-SCQ_TYPE
  1. Which of the following compounds does not show Lassaigne's test for ni...

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  2. In lassaigne's test a blue colour is obtained if the organic compound ...

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  3. Which of the following organic compound will give red colour in Lassai...

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  4. In the test of sulphur violet colour of sodium thionitroprusside is fo...

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  5. The % of sulphur in an organic compound whose 0.32 gm. Produde 0.23 gm...

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  6. Sodium extract is heated with con. HNO(3) before testing for halogens ...

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  7. To determinent the weight of a halogen in orangic compound, the compou...

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  8. Detection of the chlorine is possible without preparing sodium extract...

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  9. During the testing for phosphorus in organic compounds, a yellow solut...

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  10. In Lassaigne’s test, the organic compound is fused with a piece of sod...

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  11. In the Lassaigne's test for the detection of nitrogen in an organic co...

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  12. In the Lassaigne’s test, the blood red colouration is due to the forma...

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  13. In Lassaigne's test for nitrogen the blue colour is due to the formati...

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  14. In Kjeldahl's method, nitrogen present is estimated as :

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  15. The percentate of sulphur in the organic, when 0.2595g of a sulphur co...

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  16. If 0.228 g of silver salt of dibasic acid gabe a residue of 0.162 g of...

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  17. In Carius tube the compound ClCH(2)-COOH was heated with fuming HNO...

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  18. Lassaigne's test for the detection of nitrogen fails in

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  19. The compound that does not give a blue colour in Lassaigne's test is

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  20. The Lassaigne's extract is boiled with dil. HNO(3) before testing for ...

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