Diazonium Salts (Importance in Synthetic Organic Chemistry) NEET Questions

Organic Chemistry - Organic Compounds Containing Nitrogen

Diazonium Salts (Importance in Synthetic Organic Chemistry) MCQ Questions


1.
Aromatic diazonium salts are prepared by treating a primary aromatic amine with nitrous acid at low temperature, in a reaction known as:
A.
Sulfonation
B.
Diazotization
C.
Hydrolysis
D.
Nitration
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ANSWER :
B. Diazotization
2.
In the laboratory preparation of benzenediazonium chloride, aniline is treated with sodium nitrite (NaNO₂) and which acid?
A.
Dilute acetic acid
B.
Concentrated sulphuric acid only
C.
Dilute nitric acid only
D.
Dilute hydrochloric acid (HCl)
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ANSWER :
D. Dilute hydrochloric acid (HCl)
3.
The diazotization reaction of aniline to form benzenediazonium chloride is carried out at a low temperature range of approximately:
A.
150-200°C
B.
50-60°C
C.
0-5°C
D.
100°C (boiling)
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ANSWER :
C. 0-5°C
4.
The reagent nitrous acid (HNO₂), required for diazotization, is generally not stable enough to be stored and is instead generated in situ by reacting sodium nitrite with:
A.
A mineral acid such as HCl
B.
Sodium hydroxide
C.
Distilled water alone
D.
Ammonia solution
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ANSWER :
A. A mineral acid such as HCl
5.
Maintaining a low temperature (0-5°C) during the diazotization reaction is essential mainly to prevent:
A.
The formation of the diazonium salt altogether
B.
The oxidation of aniline into nitrobenzene
C.
The complete evaporation of hydrochloric acid used in the reaction
D.
The decomposition of the unstable diazonium salt formed
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ANSWER :
D. The decomposition of the unstable diazonium salt formed
6.
The general structure of an aromatic diazonium salt can be represented as:
A.
Ar-N=N-Ar (a symmetrical azo compound)
B.
Ar-NO₂ (a nitro compound)
C.
Ar-N₂⁺X⁻ (where Ar is an aryl group and X is an anion such as Cl⁻)
D.
Ar-NH₂ (a simple primary amine)
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ANSWER :
C. Ar-N₂⁺X⁻ (where Ar is an aryl group and X is an anion such as Cl⁻)