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Aldehydes, Ketones and Carboxylic Acids

Maharashtra Board · Class 12 · Chemistry

Quick revision notes for Aldehydes, Ketones and Carboxylic Acids — Maharashtra Board Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

45 questions25 flashcards5 concepts

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Key Topics to Revise

1

Classification and Structure

  • Carbonyl group (C=O) is the functional group common to aldehydes and ketones
  • Aldehydes: -CHO group (formyl group) attached to at least one hydrogen
  • Ketones: C=O group attached to two alkyl/aryl groups (ketonic carbonyl)
2

Nomenclature

  • IUPAC names: Aldehydes end in '-al', ketones in '-one', acids in '-oic acid'
  • Aldehydes: Replace 'e' of alkane with 'al' (methanal, ethanal, propanal)
  • Ketones: Replace 'e' of alkane with 'one', number from nearest end to C=O
3

Preparation Methods

  • Oxidation of alcohols: Primary alcohols → aldehydes, Secondary alcohols → ketones
  • Dehydrogenation: Alcohols over Cu at 573K give aldehydes/ketones
  • Ozonolysis: Alkenes with O₃ followed by Zn/H₂O give carbonyl compounds
4

Physical Properties

  • Polar C=O bond leads to dipole-dipole interactions
  • Lower aldehydes/ketones are water-soluble due to hydrogen bonding
  • Boiling points increase with molecular mass due to stronger van der Waals forces

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Full Notes

Key Concepts

The carbonyl group (C=O) is polarAldehydes haveMultiple synthetic routes existThe electrophilic carbonyl carbon undergoes nucleophilicAldehydes/ketones with α

Frequently Asked Questions

What are the important topics in Aldehydes, Ketones and Carboxylic Acids for Maharashtra Board Class 12 Chemistry?
Aldehydes, Ketones and Carboxylic Acids covers several key topics that are frequently asked in Maharashtra Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Aldehydes, Ketones and Carboxylic Acids — Maharashtra 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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