What will formed when salicyclic acid is heated?

Which of the following products is formed when adipic acid is heated ?

What is formed when oxalic acid is dehydrated by conc. H_2 SO_4 ?

What product is formed when acetic acid heated with P_(2)O_(5)

The compound formed when malonic acid is heated with urea, is :

What products are formed when acetic acid is reacted separately with phosphorus trichloride and chlorine in presence of phosphorus as catalyst ?

What will be product when glycine, is heated -

Phenol can be converted into salicyclic acid by heating with :

Fill in the blanks with suitable words : When acetic acid is heated with phosphorus pentaoxide ............. is formed.

What happens when : Malonic acid is heated