6.6 Aldehydes and Ketones 6.6.1 Aldehyde Structures LO: I understand the structure and nomenclature of aldehydes.

An alkanal (aldehyde) has a group at the end of the carbon chain. carbonyl Alkanals have the the functional group: -CHO or Example: C H O CH3CH2CHO propanal LO: I understand the structure and nomenclature of alkanals.

6.6.2 Alkanone Structures LO: I understand the structure and nomenclature of alkanones.

An alkanone (ketone) has a carbonyl group within the carbon chain. Alkanones have the the functional group: or -COC- Example: CH3CH2COCH2CH2CH3 hexan-3-one LO: I understand the structure and nomenclature of alkanones.

6.6.3 Distinguishing Tests LO: I know how to distinguish between alkanals and alkanones chemically.

Two carbonyl compounds, X and Y, are reacted with oxidising agents. Reaction with X with Y Acidified dichromate Benedicts reagent Tollen’s reagent orange green no reaction blue orange no reaction colourless silver no reaction alkanal From the results, compound X is an and compound Y is an . alkanone LO: I know how to distinguish between alkanals and alkanones chemically.