Qualitative Analysis of Organic Compounds
Chemistry ⇒ Carbon and Organic Chemistry
Qualitative Analysis of Organic Compounds starts at 11 and continues till grade 12.
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See sample questions for grade 11
A student is given an organic compound and asked to detect the presence of nitrogen. Describe the steps they should follow using the Lassaigne’s test.
A student performs the Lassaigne’s test and observes a blood red color upon addition of FeCl₃ to the extract. What does this indicate?
Describe the chemical reaction that occurs when an organic compound containing nitrogen is fused with sodium in the Lassaigne’s test.
Describe the procedure for detecting halogens in an organic compound using Lassaigne’s extract.
Describe the role of FeSO₄ in the detection of nitrogen in the Lassaigne’s test.
Describe the test for the detection of oxygen in an organic compound.
Explain why it is necessary to acidify the Lassaigne’s extract with dilute nitric acid before testing for halogens.
Explain why sodium is used in the Lassaigne’s test.
Explain why the Lassaigne’s test is not suitable for detecting oxygen in organic compounds.
Explain why the Lassaigne’s test may fail to detect halogens in the presence of excess sodium during fusion.
Explain why the Lassaigne’s test may give a false negative result for nitrogen if the organic compound contains nitro or azo groups.
State the reason why sodium metal must be handled carefully during the Lassaigne’s test.
The Lassaigne’s test is used to detect which elements in an organic compound?
What is the color of the Prussian blue compound formed during the detection of nitrogen in Lassaigne’s test?
