Illustrate the following reactions giving a suitable example for each.

 (i) Cross aldol condensation

 (ii) Decarboxylation

i) Cross aldol condensation: The reaction between an aldehyde/ketone and a carbonyl compound lacking an alpha-hydrogen (cross aldol condensation) is called the Claisen-Schmidt condensation. It gives a mixture of four products.

ii) Decarboxylation refers to the reaction in which carboxylic acids lose carbon dioxide to form hydrocarbons when their sodium salts are heated with soda-lime.