They oxide with ease in comparison to most ketones. The aldehyde group is occasionally called the formyl or methanoyl group. Thus the chemical formula for an aldehyde functional group is -CHO, and the general formula for an aldehyde is R-CHO. Therefore, it is only necessary to know about the chemistry of a few generic functions in order to predict the chemical behaviour of thousands of real organic chemicals. Functional Group: Aldehyde Purpose: Aldehydes are differentiated noncarbonyl compounds through their derivatives of ammonia reactions. This functional group consists of a carbon atom bonded to a hydrogen atom with a single covalent bond and an oxygen atom with a double bond. The reduction of aldehyde is carried out by using a reagent known as N a B H 4 NaB N a B H 4 than other molecules with different functional groups like ketone, ester, amide, carboxylic acid, as shown in the figure. The functional group approach 'works' because the properties and reaction chemistry of a particular functional group (FG) can be remarkably independent of environment.