Detection of Extra Elements (Nitrogen, Sulphur, Halogens) in Organic Compounds NEET Questions

Organic Chemistry - Principles of Practical Chemistry

Detection of Extra Elements (Nitrogen, Sulphur, Halogens) in Organic Compounds MCQ Questions


1.
Lassaigne's test is used for the detection of which elements in organic compounds?
A.
Iron, Copper, and Zinc
B.
Sodium, Potassium, and Calcium
C.
Carbon, Hydrogen, and Oxygen
D.
Nitrogen, Sulphur, and Halogens (Cl, Br, I)
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ANSWER :
D. Nitrogen, Sulphur, and Halogens (Cl, Br, I)
2.
Lassaigne's test is also commonly known as:
A.
Tollens' test
B.
Sodium fusion test
C.
Fehling's test
D.
Schiff's test
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ANSWER :
B. Sodium fusion test
3.
The principle behind Lassaigne's test is:
A.
Hydrolysis of organic compound by water
B.
Reduction of elements to metals
C.
Oxidation of all elements to gaseous oxides
D.
Conversion of covalently-bound elements (N, S, halogens) into ionic form using sodium fusion
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ANSWER :
D. Conversion of covalently-bound elements (N, S, halogens) into ionic form using sodium fusion
4.
Why are nitrogen, sulphur, and halogens converted to ionic form before detection in organic compounds?
A.
They evaporate at room temperature
B.
They are radioactive in covalent form
C.
These elements are covalently bound and cannot be detected directly by aqueous reagents
D.
They give wrong colours when covalent
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ANSWER :
C. These elements are covalently bound and cannot be detected directly by aqueous reagents
5.
Sodium fusion extract is also known as:
A.
Lassaigne's extract
B.
Tollens' reagent
C.
Fehling's solution
D.
Benedict's solution
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ANSWER :
A. Lassaigne's extract
6.
In preparing sodium fusion extract, the organic compound is fused with:
A.
Magnesium ribbon
B.
A small piece of dry sodium metal
C.
Concentrated Hâ‚‚SOâ‚„
D.
Calcium oxide
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ANSWER :
B. A small piece of dry sodium metal