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Which of the following compound gives bl...

Which of the following compound gives blood red colouration when its Lassigne's extract is treated with alkali and ferric chloride ?

A

Thiourea

B

Dipheny sulphide

C

Phenylhydrazine

D

Benzamide

Text Solution

Verified by Experts

The correct Answer is:
A
Thiourea contains `C,N` and `S` and thus forms `NaCNS` and hence gives blood red colouration with `FeCl_(3)`.
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A2Z-CLASSIFICTION, PURIFICATION AND NOMENCLATURE OF ORGANIC COMPOUNDS-Purification Of Organic Compounds
  1. A mixture of camphor and benzoic aci can be separated by

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  2. Lassaigne's test for the detection of N fails in :

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  3. Which of the following compound gives blood red colouration when its L...

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  4. Lassaigne's extract of p-nitrochlorobenzene is acidified with dil. HNO...

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  5. Positive Beilstein test for halogen shows that

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  6. For the detection of phosphorus, the organic compound after fustion wi...

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  7. Sometimes, the colour observed in Lassaigne's test for nitrogen is gre...

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  8. Which of the following compound will give white precipitate on heating...

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  9. Lassaigne's extract of thiourea, SC(NH(2))(2) is boiled with ferrous s...

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  10. The sodium extract on acidification with acetric acid and then adding ...

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  11. In the estimation of sulphur organic compound on treating with conc. H...

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  12. In the Lassaigne's , test the sulphur present in the organic compound ...

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  13. In the qualitative analysis of nitrate a brown ring is formed due to t...

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

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  15. Which of the following statements is wrong?

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  16. The presence of halogen, in an organic compounds, is detected by

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  17. 2 g of an organic nitrogen-containing compound, on heating, decompose...

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  18. 0.5g of an organic compound on Kjeldahl's analysis gave enough ammonia...

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  19. In an experiment 0.22g of magnesium pyrophosphate was produced from 0....

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  20. 116 mg of a compound on vaporisation in a Victor - Meyer's apparatus d...

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