Same chapter3 marksDifficulty: Medium
How would you distinguish between an aldehyde and a ketone in the laboratory?
Aldehydes, Ketones and Carboxylic Acids
3 marksDifficulty: Medium
Arrange acetic acid, chloroacetic acid and trichloroacetic acid in increasing order of acidity and give the reason.
Original Khojo Papers practice question — not from a past board paper.
Answer
Acetic acid < chloroacetic acid < trichloroacetic acid. Chlorine is electron-withdrawing, so it disperses the negative charge of the carboxylate ion and stabilises it; the more chlorine atoms, the greater the effect and the stronger the acid.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The effect falls off rapidly with distance from the carboxyl group.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
What is the iodoform test, and which compounds give a positive result?
Aldehydes, Ketones and Carboxylic Acids
Same chapter3 marksDifficulty: Medium
Why are aldehydes more reactive than ketones towards nucleophilic addition?
Aldehydes, Ketones and Carboxylic Acids
Same chapter3 marksDifficulty: Medium
Describe the aldol condensation and the Cannizzaro reaction, and say which aldehydes undergo each.
Aldehydes, Ketones and Carboxylic Acids
Same subject3 marksDifficulty: Medium
What is the van't Hoff factor, and what values does it take for sodium chloride and for acetic acid in benzene?
Solutions
Same subject3 marksDifficulty: Medium
Distinguish between Schottky and Frenkel defects and state the effect of each on density.
Solid State