हिंदी
Tamil Nadu Board of Secondary EducationHSC Science Class 12

Chemical Properties of Aldehydes and Ketones

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Estimated time: 2 minutes
Maharashtra State Board: Class 12

Key Points: Chemical Properties of Aldehydes and Ketones

  • Oxidation: Aldehydes → RCOOH (same C) with dil. HNO₃/KMnO₄/K₂Cr₂O₇; Ketones undergo C–C cleavage with CrO₃, giving two carboxylic acids.
  • Reduction: Clemmensen (Zn-Hg/conc. HCl) and Wolf-Kishner (NH₂-NH₂ then KOH/HOCH₂CH₂OH, Δ) both convert >C=O to >CH₂.
  • Electrophilic Substitution: –CHO is EWG (inductive + resonance); deactivates ring; directs electrophile (NO₂⁺) to meta position.
  • Lab Tests: Schiff (pink), Tollens (silver mirror), Fehling (red Cu₂O ppt) — for aldehydes; Sodium nitroprusside (red) — for ketones.
  • Nucleophilic Reactions: HCN → cyanohydrin; NaHSO₃ → bisulphite adduct; ROH/dry HCl → hemiacetal/acetal/ketal; NaOI → haloform (CHI₃); dil. NaOH → Aldol condensation; No α-H + NaOH → Cannizzaro reaction.
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