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Which of the following compounds gives b...

Which of the following compounds gives blood red colouration when its Lassaigne's extract is treated with alkali and ferric chloride .

A

thiourea

B

diphenyl sulphide

C

phenylhydrazine

D

benzamide

Text Solution

Verified by Experts

The correct Answer is:
A
Thiourea `(NH_(2)CSNH_(2))` contains both N and S and hence gives blood red colouration in Lassaigne's test.
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PRADEEP-ORGANIC CHEMISTRY-SOME BASIC PRINCIPLES TECHNIQUES-Competition Focus (Jee (Main and Advanced)/Medical Entrance) I. Multiple choice Questions (With One Correct Answer)
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  2. In the Lassaigne's test for the detection of nitrogen in an organic co...

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  3. The LaSSaigen's extract is boiled with conc. HNO(3) while testing for...

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  4. Lassaigne's test (with silver nitrate) is commonly used to detect halo...

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  5. Which of the following compounds will not give Lassaigne's test for ni...

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  6. Which of the following compounds gives blood red colouration when its ...

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  7. The colour of the solution/precipitate obtained in the elemental analy...

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  8. Correct pair of compounds which gives blue colouration/precipitate and...

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  9. 0.30g of an organic compound containing C, H, and O an combustion yiel...

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  10. An organic compound having molecular mass 60 is found to contain C = 2...

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  11. In Duma's method for estimation of nitrogen. 0.25 g of an organic comp...

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  12. Nitrogen can be estimated by Kjeldahl's method for which of the follow...

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  13. In the Kjeldahl's method for estimation of nitrogen present in a soil ...

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  14. The ammonia evolved from the treatment of 0.03 g of an organic compoun...

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  15. 29.5 mg of an organic compound containing nitrogen was digested accord...

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  16. A samlpe of 0.5 of an organic compound was analysed using Kjeldahl' me...

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  17. For the estimation of nitrogen, 1.4 g of an organic compound was diges...

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  18. In Carius method of estimation of halogens 250 mg of an organic compou...

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  19. In the estimation of sulphur by Carius method, 0.480 f og an organic c...

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  20. A gaseous hydrocarbon gives upon combustion, 0.72 g of water and 3.08 ...

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