NEET Chemistry: Importance in synthetic organic chemistry Practice Questions
13 free multiple-choice questions on Importance in synthetic organic chemistry (Diazonium Salts) for NEET Chemistry, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. In the synthesis of complex heterocyclic compounds, diazonium salts can act as precursors for introducing nitrogen-containing functional groups. Which transformation best exemplifies this role in complex synthesis?
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Correct answer: C — Synthesis of heterocyclic rings
Diazonium chemistry is useful in preparing precursors that can cyclize or react to form various nitrogen-containing heterocyclic structures, which is vital in synthesizing complex organic targets.
Q2. Which chemical principle governs the ability of diazonium salts to participate in various synthetic pathways?
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Correct answer: A — The high potential energy of the diazo group enabling substitution reactions.
The reactivity is fundamentally governed by the high potential energy of the diazo group, which drives the facile replacement reactions necessary for constructing new molecular architectures.
Q3. The primary utility of diazonium salts in synthetic organic chemistry is related to which type of transformation?
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Correct answer: D — Conversion of amino groups into various functional groups
Diazonium salts are crucial because they allow the conversion of aromatic primary amines (Ar-NH₂) into aryl halides, phenols, or azo compounds, facilitating the introduction of diverse substituents onto the benzene ring.
Q4. When diazonium salts react with water or ammonia, what functional groups are typically formed, highlighting their role in functional group transformation?
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Correct answer: B — Phenols or Amines
Diazonium salts react with water or ammonia to generate phenols or aromatic amines, making them precursors for these important functional groups.
Q5. In the context of synthetic chemistry, the formation of azo dyes relies heavily on which intermediate derived from diazonium salts?
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Correct answer: A — Diazonium salts
Azo dyes are formed via the coupling reaction of diazonium salts with electron-rich compounds, making diazonium salts central to the synthesis of colorants and complex organic molecules.
Q6. The reactivity of diazonium salts, despite their inherent instability, is exploited because they provide a pathway to synthesize molecules that are otherwise difficult to access. What type of synthetic bond formation is often enabled by this reactivity?
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Correct answer: C — Azo coupling
The intermediate nature allows for the formation of new bonds by displacing the diazo group, facilitating the creation of complex molecules through stepwise reactions, often involving C-N bond manipulation in complex syntheses.
Q7. Which functional group dictates the high reactivity and instability of diazonium salts?
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Correct answer: C — Presence of the nitrogen group
The instability and high reactivity of diazonium salts (R-N₂⁺) stem primarily from the presence of the diazo group, which is an intermediate highly susceptible to decomposition and reaction to eliminate dinitrogen gas (N₂).
Q8. Which class of compounds is primarily important in synthetic organic chemistry due to their role as precursors for introducing various functional groups on aromatic rings?
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Correct answer: B — Diazonium Salts
Diazonium salts are highly versatile intermediates used to introduce various functional groups (like -OH, -NH₂, -CN) onto benzene derivatives via substitution reactions.
Q9. Which of the following statements best describes the general synthetic utility of diazonium salts in introductory organic chemistry?
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Correct answer: B — They serve as precursors for introducing nitrogen or halogen atoms onto aromatic systems.
Diazonium salts are important because the diazo group allows for the controlled replacement of the diazo group with various other functional groups, enabling the synthesis of complex aromatic compounds.
Q10. The conversion of an aromatic amine to a diazonium salt is typically achieved by reacting the amine with which reagent?
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Correct answer: B — Sodium nitrite (NaNO₂)
Aromatic amines are diazotized by treating them with nitrous acid (formed in situ from sodium nitrite and acid), which converts the amino group into the diazonium salt.
Q11. Why is the careful handling and temperature control essential when working with diazonium salts in a laboratory setting?
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Correct answer: A — They are thermally unstable and potentially explosive.
Diazonium salts are known to be thermally unstable. Controlled reaction conditions are necessary to manage their reactivity and prevent dangerous decomposition or explosive reactions.
Q12. Which reaction, involving diazonium salts and copper salts, is a classic example used in the synthesis of aryl halides (like Ar-Cl) from anilines?
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Correct answer: D — Sandmeyer reaction
The Sandmeyer reaction is a key method in organic synthesis where diazonium salts are reacted with copper salts (CuX) to replace the diazo group with halogen atoms.
Q13. Which type of reaction is primarily used to introduce halogen atoms onto an aromatic ring using diazonium salts?
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Correct answer: D — Sandmeyer reaction
The Sandmeyer reaction is a key method where diazonium salts are reacted with copper(I) salts (like CuCl or CuBr) to replace the diazo group (N₂⁺) with a halogen atom (Cl or Br), effectively introducing halogens onto the benzene ring.
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