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Aldehydes, Ketones and Carboxylic Acids

Haryana Board · Class 12 · Chemistry

Step-by-step guide to study Aldehydes, Ketones and Carboxylic Acids in Haryana Board Class 12 Chemistry. Topics to cover, practice strategy, and time allocation.

51 questions25 flashcards5 concepts

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A labeled diagram showing the selective partial reduction of nitriles and esters to aldehydes using DIBAL-H (Diisobutylaluminum hydride) at low temperatures, followed by hydrolysis.
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Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas, and key concepts.

2
Day 3

Practice Problems

Solve textbook exercises and additional practice questions. There are 51 questions available for this chapter.

3
Day 4

Revise & Test

Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.

4
Day 7

Spaced Revision

Revisit Aldehydes, Ketones and Carboxylic Acids after a week. Use flashcards for quick recall. Solve previous year questions from this chapter.

What to Focus On

  • Carbonyl carbon is sp²-hybridised with trigonal planar geometry and ~120° bond angles
  • C=O is polar due to higher electronegativity of oxygen; carbon is electrophilic, oxygen is nucleophilic
  • Aldehydes: -CHO group (C=O bonded to one carbon and one hydrogen)

  • Primary alcohols → Aldehydes; Secondary alcohols → Ketones (oxidation/dehydrogenation)
  • Rosenmund reduction: RCOCl + H₂/Pd-BaSO₄ → RCHO (BaSO₄ prevents over-reduction)
  • Stephen reaction: RCN + SnCl₂/HCl → RCHO (via imine intermediate, then hydrolysis)

  • Methanal is a gas; ethanal is a volatile liquid; higher members are liquids or solids
  • B.P.: Aldehydes/Ketones > Ethers > Hydrocarbons (same mol. mass) due to dipole-dipole forces
  • B.P.: Aldehydes/Ketones < Alcohols (same mol. mass) — no intermolecular H-bonding between carbonyl compounds

Common Mistakes to Avoid

Ketones cannot be oxidised at all, so they never give positive Tollens' or Fehling's test

Carboxylic acids are strong acids like HCl or H2SO4 because they contain the acidic -COOH group

Electron-donating groups always increase acidity and electron-withdrawing groups always decrease acidity of carboxylic acids

Memory Tips

Difference between Aldehydes and Ketones — structural distinction

Rosenmund Reduction — Acyl chloride to Aldehyde

Stephen Reaction — Nitrile to Aldehyde using SnCl2/HCl

Gattermann-Koch Reaction — Benzene to Benzaldehyde using CO + HCl + AlCl3

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Frequently Asked Questions

What are the important topics in Aldehydes, Ketones and Carboxylic Acids for Haryana Board Class 12 Chemistry?
Key topics in Aldehydes, Ketones and Carboxylic Acids include Complete Concept Map: Aldehydes, Ketones and Carboxylic Acids, Overview of Carbonyl Compounds, Carbonyl Compounds — Master Mind Map. These are the concepts Haryana Board Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Aldehydes, Ketones and Carboxylic Acids — Haryana Board Class 12 Chemistry?
Understand the core concepts first, then work through the 51 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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