Aldehydes

In this video I look at the preparation of carboxylic acids from four other organic functional groups. First, from primary alcohols and aldehydes by the process of oxidation, and second, from esters and nitriles by the process of either acid-catalysed hydrolysis or alkaline catalysed hydrolysis.

This video looks at many of the possible isomers that share the molecular formula C6H12O. All of the possible aldehydes and ketones are included.

This video reviews the three main types of intermolecular force by way of explaining the boiling points of aldehydes and ketones and their solubility in water. It looks at van der Waals forces, dipole-dipole forces and hydrogen bonding.

This short video looks at the preparation of aldehydes and ketones by the oxidation of primary and secondary alcohols using acidified potassium dichromate. The redox chemistry is considered in reasonable detail as well.

This video looks at the use of lithium aluminium hydride (lithal) to reduce aldehydes and ketones to alcohols. It begins by looking at simple reaction shemes where the lithal is represented by [H]. It moves on to show an animation of the practical procedure itself and finally looks at the reaction mechanism (nucleophilic addition with hydride ions).

This video looks in detail at the use of 2,4-dinitrophenylhydrazine (Brady's reagent) to identify specific aldehydes and ketones. It examines the mechanism and demonstrates the practical procedure.

This video looks in detail at the three common tests used to distinguish between aldehydes and ketones. They all work on the basis that aldehydes can behave as reducing agents while ketones cannot. 1. Fehling's solution. 2. Tollen's reagent. 3. Acidified potassium dichromate.