The preparation of acetaldehyde by passing mixture of ethene and oxygen under pressure into aqueous solution of PdCl2 and CuCl2 as a catalyst is called Wacker’s process. Acetalydehyde is a useful chemical which is used for silvering of mirror. It can be prepared by various methods. It is used in the commercial preparation of acetic acid, ethyl acetate etc. Paraldehyde, a trimer of aldehyde is used as hypnotic. (a) Give the best method to prepare acetaldehyde. Give two reasons. (b) Give the chemical equation for Wacker’s process of preparation of acetaldehyde. (c) Give the disadvantage of preparing it from ethyne.
