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Aldehydes, Ketones and Carboxylic Acids

Telangana Open School (TOSS) · Class 12 · Chemistry

Quick revision notes for Aldehydes, Ketones and Carboxylic Acids — Telangana Open School (TOSS) Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

Nomenclature of Aldehydes and Ketones

  • Aldehydes are named as alkanals by replacing the '-e' of the parent alkane with '-al'.
  • The carbonyl carbon in aldehydes is always at position 1 and is not numbered in the name.
  • When the -CHO group is attached to a ring, the compound is named as a carbaldehyde.
2

Preparation of Aldehydes and Ketones

  • Primary alcohols oxidize to aldehydes using PCC or PDC in anhydrous conditions.
  • Secondary alcohores oxidize to ketones using common oxidizing agents like K₂Cr₂O₇.
  • Ozonolysis of alkenes produces aldehydes or ketones depending on substituents.
3

Physical Properties and Reactivity

  • Carbonyl group is polar due to electronegativity difference between C and O.
  • Aldehydes and ketones have higher boiling points than hydrocarbons due to dipole-dipole interactions.
  • Lower members are soluble in water due to hydrogen bonding with H₂O.
4

Reactions of Aldehydes and Ketones

  • Nucleophilic addition: e.g., with HCN to form cyanohydrins.
  • Formation of hemiacetals and acetals — important in sugar chemistry.
  • Reaction with ammonia derivatives gives crystalline derivatives for identification.

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Full Notes

Key Concepts

Aldehydes are named as alkanals byAldehydes and ketones can be preparedThe C=O bond is polar dueAldehydes and ketones undergo nucleophilic additionCarboxylic acids are more acidic than

Frequently Asked Questions

What are the important topics in Aldehydes, Ketones and Carboxylic Acids for Telangana Open School (TOSS) Class 12 Chemistry?
Aldehydes, Ketones and Carboxylic Acids covers several key topics that are frequently asked in Telangana Open School (TOSS) 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 — Telangana Open School (TOSS) Class 12 Chemistry?
Understand the core concepts first, then work through the 53 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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