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Chemguide – answers. ALDEHYDES AND KETONES: REDUCTION. 1. a) [AlH4]- and [BH4]-. (You will find these written with or without the square brackets.) b). Aldehydes and Ketones Menu. An introduction to aldehydes and ketones, their reactivity and their physical properties. Their preparation by the oxidation of primary or secondary alcohols. The addition of hydrogen cyanide and of sodium hydrogensulphite (sodium bisulphite) to aldehydes and ketones. Chemguide – answers. ALDEHYDES AND KETONES: OXIDATION. 1. a). Oxidising agent. Observations with an aldehyde a ketone. Potassium dichromate(VI). You will remember that the difference between an aldehyde and a ketone is the presence of a hydrogen atom attached to the carbon-oxygen double bond in the aldehyde. Ketones don't have that hydrogen. The presence of that hydrogen atom makes aldehydes very easy to oxidise. The preparation of aldehydes and ketones from primary and secondary alcohols. Chemguide – answers. ALDEHYDES AND KETONES: SIMPLE ADDITION REACTIONS. 1. a) Hydrogen cyanide is an extremely poisonous gas. b) A solution of Chemguide – answers. ALDEHYDES AND KETONES: THE TRIIODOMETHANE (IODOFORM). REACTION. 1. a) Either: Add iodine solution followed by enoughChemguide – answers. ALDEHYDES AND KETONES: INTRODUCION. 1. a). A: ketone butanone (You could call this butan-2-one (and lots of people do!), but Both aldehydes and ketones contain a carbonyl group. That means that their reactions are very similar in this respect. An aldehyde differs from a ketone by having a hydrogen atom attached to the carbonyl group. This makes the aldehydes very easy to oxidise. This page looks at the reduction of aldehydes and ketones by two similar reducing agents - lithium tetrahydridoaluminate(III) (also known as lithium aluminium hydride) and sodium tetrahydridoborate(III) (sodium borohydride). In general terms, reduction of an aldehyde leads to a