Aldehydes & Ketones
- Created by: Carys
- Created on: 27-11-15 20:49
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- Aldehydes & Ketones
- Carbonyl (C=O)
- Brady's reagent
- tests for C=O
- bright orange precipitate
- derivative of carbonyl compound
- measuring melting point to identify compound
- derivative of carbonyl compound
- 2,4-DNPH
- Iodine
- carbonyls that contain a methyl carbonyl group react when heated with iodine in the presence of an alkali
- yellow precipitate of CHI3 and an antiseptic smell
- carbonyls that contain a methyl carbonyl group react when heated with iodine in the presence of an alkali
- Brady's reagent
- Aldehydes
- Oxidation
- carboxylic acid
- when heated under reflux with acidified potassium dichromate ions
- colour change: orange to green
- when heated under reflux with acidified potassium dichromate ions
- Tests for Aldehydes
- Tollen's reagent
- colourless solution of silver nitrate dissolved in aqueous ammonia
- if heated with an aldehyde in a test tube in a water bath - silver mirror formed
- colourless solution of silver nitrate dissolved in aqueous ammonia
- Fehling's solution
- blue solution of complexed copper (II) ions dissolved in sodium hydroxide
- if heated with an aldehyde in a test tube in a water bath the copper (II) ions are reduced to a brick-red precipitate
- Benedict's solution
- copper (II) ions are dissolved in sodium carbonate instead
- brick-red precipitate of copper (I) oxide
- copper (II) ions are dissolved in sodium carbonate instead
- blue solution of complexed copper (II) ions dissolved in sodium hydroxide
- Tollen's reagent
- carboxylic acid
- Reduction via reducing agent LiAlH4 in dry diethyl ether
- aldehyde = primary alcohol
- ketone = secondary alcohol
- Oxidation
- Carbonyl (C=O)
- Brady's reagent
- tests for C=O
- bright orange precipitate
- derivative of carbonyl compound
- measuring melting point to identify compound
- derivative of carbonyl compound
- 2,4-DNPH
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