Which of the following is the industrial method of preparation of acetaldehyde?

Acetaldehyde is an organic compound having formula 퐶퐻3퐶퐻푂 and industrially it is prepared from Wacker process, in which the alkene is treated with water in the presence of palladium chloride or copper chloride. Acetaldehyde is easily prepared from ethene. Since palladium chloride is an expensive catalyst so, copper chloride is mostly used. so copper chloride is used for regeneration of palladium. 퐶퐻2 = 퐶퐻2 + 푃푑퐶푙2 + 퐻2푂 퐶푢퐶푙2푂2 → 퐶퐻3퐶퐻푂+ 푃푑+ 2퐻퐶푙 [푃푑+ 2퐻퐶푙→푃푑퐶푙2 + 퐻2] [푃푑+ 2퐶푢퐶푙2 →푃푑퐶푙2 + 2퐶푢퐶푙] [2퐶푢퐶푙+ 1 2 푂2 + 2퐻퐶푙→2퐶푢퐶푙2 + 퐻2푂] Physical and chemical properties of Aldehydes &Ketones