NEET UG · Chemistry

Organic Compounds Containing Nitrogen

17 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 17 questions

  1. Why is the Gabriel phthalimide synthesis specifically restricted to the preparation of primary aliphatic amines and cannot be used to synthesize aniline (primary aromatic amine)?
  2. What is the product obtained when ethanamide (CH3CONH2) undergoes the Hoffmann bromamide degradation reaction with bromine and aqueous potassium hydroxide?
  3. What is the correct order of basic strength of methyl-substituted amines and ammonia in aqueous solution?
  4. What is the correct order of basic strength of ethyl-substituted amines and ammonia in aqueous solution?
  5. Why is aniline (C6H5NH2) a vastly weaker base than aliphatic amines like cyclohexylamine (pKb of aniline ≈ 9.38 vs pKb of cyclohexylamine ≈ 3.3)?
  6. Which class of amines gives a positive carbylamine test (isocyanide test), characterized by the release of an extremely foul-smelling carbylamine upon heating with chloroform and ethanolic KOH?
  7. In the Hinsberg test used to distinguish between primary, secondary, and tertiary amines, how does a primary amine behave upon reaction with benzenesulfonyl chloride (C6H5SO2Cl) and subsequent additio…
  8. Why does the direct nitration of aniline with a concentrated nitrating mixture (HNO3 + H2SO4 at 288 K) unexpectedly yield a substantial amount (47%) of meta-nitroaniline alongside 51% para-nitroanilin…
  9. Why does aniline fail to undergo Friedel-Crafts alkylation or acylation reactions when treated with alkyl or acyl halides in the presence of anhydrous aluminum chloride (AlCl3)?
  10. What is the organic product formed when benzenediazonium chloride (C6H5N2+Cl-) is warmed with hypophosphorous acid (H3PO2) in aqueous solution?
  11. Which reaction converts benzenediazonium fluoroborate into fluorobenzene upon thermal decomposition?
  12. What type of colored organic compound is produced when benzenediazonium chloride is coupled with phenol in an alkaline medium (pH 9-10)?
  13. Which reagent is employed in the Mendius reaction to reduce an aliphatic alkyl nitrile (cyanide) into a primary amine?
  14. What happens when a primary aliphatic amine, such as ethylamine (CH3CH2NH2), reacts with nitrous acid (HNO2, generated from NaNO2 + HCl) at room temperature?
  15. Why is the reduction of nitrobenzene to aniline using iron scrap and hydrochloric acid (Fe + HCl) industrially preferred over tin and hydrochloric acid (Sn + HCl)?
  16. To prepare monobromoaniline (specifically p-bromoaniline) from aniline without forming 2,4,6-tribromoaniline, how must the amino group (-NH2) be chemically protected prior to bromination?
  17. What is the structural characteristic of the intermediate species involved in the rate-determining rearrangement step of the Hoffmann bromamide degradation?

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