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Organic Nitrogen Compounds — Revision Notes

Tamil Nadu Board · Class 12 · Chemistry

Organic Nitrogen Compounds revision notes for Tamil Nadu Board Class 12 Chemistry: 4 topics in quick points. Includes 1 NITRO COMPOUNDS - Classification.

45 questions36 flashcards6 formulas & key relations5 concepts

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A diagram illustrating the tautomeric relationship between hydrogen cyanide (HCN) and hydrogen isocyanide (HNC), and their corresponding alkyl derivatives, alkyl cyanides (RCN) and alkyl isocyanides (
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Key Topics to Revise

1

13.1 NITRO COMPOUNDS - Classification, Structure & Preparation

  • Nitro compounds contain the -NO₂ group bonded directly to carbon: R-NO₂
  • Nitroalkanes: Formula R-NO₂ where R is alkyl group (CₙH₂ₙ₊₁-)
  • Classification into primary (1°), secondary (2°), and tertiary (3°) based on carbon type attached to -NO₂
2

13.1.5-13.1.8 Preparation and Properties of Nitro Compounds

  • LABORATORY PREPARATION OF NITROALKANES: Heat alkyl bromide/iodide with ethanolic KNO₂ (SN2 mechanism)
  • CH₃CH₂-Br + KNO₂ → CH₃CH₂-NO₂ + KBr (follows SN2 mechanism)
  • INDUSTRIAL PREPARATION: Vapor-phase nitration at 675K - methane + HNO₃ → nitromethane + H₂O
3

13.2 AMINES - Classification, Structure & Basicity

  • Amines are organic derivatives of ammonia (NH₃) where H atoms replaced by alkyl/aryl groups
  • PRIMARY AMINES (1°): R-NH₂ (one alkyl/aryl group; can form 2 H-bonds)
  • SECONDARY AMINES (2°): R₂NH (two alkyl/aryl groups; can form 1 H-bond)
4

13.2.3-13.2.5 Preparation Methods of Amines

  • METHOD 1 - REDUCTION OF NITRO COMPOUNDS: Nitroalkanes/nitroarenes + H₂/Ni (or Sn/HCl or Pd/H₂) → Primary amines
  • CH₃CH₂-NO₂ + 6[H] → CH₃CH₂-NH₂ + 2H₂O (using Ni catalyst with H₂)
  • METHOD 2 - REDUCTION OF NITRILES: R-CN + 4[H] → R-CH₂-NH₂ (using LiAlH₄ or Na/C₂H₅OH)

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Full Notes

Key Concepts

Nitro compounds (RPrimary and secondary nitroalkanes exhibit tautomerismAmines are organic derivatives of ammoniaAmines are weak bases dueMultiple synthetic routes exist for preparing

Frequently Asked Questions

What are the important topics in Organic Nitrogen Compounds for Tamil Nadu Board Class 12 Chemistry?
Key topics in Organic Nitrogen Compounds include 1 NITRO COMPOUNDS - Classification, Structure & Preparation, 1.5-13.1.8 Preparation and Properties of Nitro Compounds, 2 AMINES - Classification, Structure & Basicity, 2.3-13.2.5 Preparation Methods of Amines. Study these first, then practise questions on each for the Tamil Nadu Board Class 12 board exam.
How should I revise Organic Nitrogen Compounds for the Tamil Nadu Board Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Organic Nitrogen Compounds. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All Tamil Nadu Board Class 12 Chemistry Revision Notes

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