Halogens, Oxygen, Nitrogen, and Sulphur NEET Questions

Organic Chemistry - Some Basic Principles of Organic Chemistry

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)