Decarboxylation

Chemical Properties OF Carboxylic Acid || Acidic Nature || Reduction with Metal || Metal Hydroxides || Metal Carbonates || Metal Hybrides || Reaction with RMGx || Decarboxylation (Oak Wood Reaction) || Decarboxylation OF Gendicarboxylic Acids || Decarboxylation Acids

Which (------COOH) group is easaily decarboxylated on heating and why?

Which of the following decarboxylates?