Halogens, Oxygen, Nitrogen, and Sulphur NEET Questions

Organic Chemistry - Some Basic Principles of Organic Chemistry
Halogens, Oxygen, Nitrogen, and Sulphur

Halogens, Oxygen, Nitrogen, and Sulphur MCQ Questions


1.
Apart from carbon and hydrogen, which of the following elements is commonly found as a constituent (heteroatom) in many organic compounds?
A.
Nitrogen, oxygen, sulphur, or halogens
B.
Only radioactive elements
C.
Only alkali metals
D.
Only noble gases
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ANSWER :
A. Nitrogen, oxygen, sulphur, or halogens
2.
The qualitative detection of elements such as nitrogen, sulphur, and halogens in an organic compound generally requires first converting the compound's covalently bonded elements into a more easily testable, detectable form, typically by converting them into:
A.
Complex organic polymers
B.
Colourless gases only
C.
Simple inorganic ions (through a fusion process)
D.
Radioactive isotopes
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ANSWER :
C. Simple inorganic ions (through a fusion process)
3.
The classical method used to convert covalently bound nitrogen, sulphur, and halogens present in an organic compound into detectable ionic forms is called:
A.
The Kjeldahl method
B.
Lassaigne's test (sodium fusion extract preparation)
C.
The Duma's method
D.
The Carius method
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ANSWER :
B. Lassaigne's test (sodium fusion extract preparation)
4.
In Lassaigne's test, the organic compound is heated (fused) strongly with a small piece of which metal?
A.
Zinc metal
B.
Copper metal
C.
Magnesium metal
D.
Sodium metal
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ANSWER :
D. Sodium metal
5.
During sodium fusion in Lassaigne's test, nitrogen present in the organic compound is converted into which sodium compound?
A.
Sodium cyanide (NaCN)
B.
Sodium nitrate (NaNO₃)
C.
Sodium nitrite (NaNOâ‚‚)
D.
Sodium nitride (Na₃N)
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ANSWER :
A. Sodium cyanide (NaCN)
6.
During sodium fusion in Lassaigne's test, sulphur present in the organic compound is converted into which sodium compound?
A.
Sodium sulphate (Naâ‚‚SOâ‚„)
B.
Sodium sulphite (Na₂SO₃)
C.
Sodium thiosulphate (Na₂S₂O₃)
D.
Sodium sulphide (Naâ‚‚S)
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ANSWER :
D. Sodium sulphide (Naâ‚‚S)
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