Diazonium Salts (Importance in Synthetic Organic Chemistry) NEET Questions

Organic Chemistry - Organic Compounds Containing Nitrogen

Diazonium Salts (Importance in Synthetic Organic Chemistry) MCQ Questions


7.
The functional group present in a diazonium salt, consisting of two nitrogen atoms joined together with an overall positive charge, is called the:
A.
Amino group (-NH₂)
B.
Diazonium group (-N≡N⁺ or -N=N⁺-)
C.
Nitro group (-NO₂)
D.
Azo group (-N=N-)
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ANSWER :
B. Diazonium group (-N≡N⁺ or -N=N⁺-)
8.
The bonding in the diazonium ion (-N≡N⁺) can be considered to involve a resonance hybrid between a triple bond structure and a doubly bonded structure, indicating that the nitrogen-nitrogen bond has:
A.
Characteristics between a double and triple bond
B.
Characteristics of an ionic bond only
C.
Purely single bond character
D.
No bonding interaction at all between the two nitrogen atoms
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ANSWER :
A. Characteristics between a double and triple bond
9.
Aromatic diazonium salts are typically obtained as:
A.
Solid metals with a lustrous appearance
B.
Insoluble oily liquids
C.
Deeply coloured gases at room temperature
D.
Colourless crystalline solids that are soluble in water
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ANSWER :
D. Colourless crystalline solids that are soluble in water
10.
Aromatic diazonium salts, though relatively more stable than aliphatic diazonium salts, are still unstable and decompose readily when:
A.
Heated or allowed to stand for a prolonged period, even at room temperature
B.
Dissolved in cold water only
C.
Exposed to darkness at low temperature
D.
Kept at temperatures below 5°C indefinitely
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ANSWER :
A. Heated or allowed to stand for a prolonged period, even at room temperature
11.
Compared to aromatic diazonium salts, aliphatic diazonium salts are:
A.
Non-existent, since aliphatic amines cannot undergo diazotization
B.
Considerably more stable and can be stored for long periods at room temperature
C.
Extremely unstable and decompose almost immediately, even at low temperature
D.
Completely insoluble in water
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ANSWER :
C. Extremely unstable and decompose almost immediately, even at low temperature
12.
Aromatic diazonium salts are generally used immediately after preparation, in the same reaction vessel, without isolation, mainly because they:
A.
Are completely unreactive towards further chemical transformations
B.
Are unstable and can decompose or explode if isolated and stored, especially in the dry solid state
C.
Cannot be dissolved in any solvent for further reactions
D.
Require extremely high temperatures for any further reaction to proceed
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ANSWER :
B. Are unstable and can decompose or explode if isolated and stored, especially in the dry solid state