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Organic Nitrogen Compounds

Tamil Nadu Board · Class 12 · Chemistry

Quick revision notes for Organic Nitrogen Compounds — Tamil Nadu Board Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

45 questions36 flashcards5 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 Mind map showing classification of nitro compounds into nitroalkanes (by primary, secondary, tertiary) and nitroarenes, Flowchart showing four types of isomerism in nitro compounds: chain, position, functional, and tautomerism, Flowchart showing five different methods for preparing nitroalkanes with their conditions and mechanisms. These are the concepts Tamil Nadu Board Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Organic Nitrogen Compounds — Tamil Nadu Board Class 12 Chemistry?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and 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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