List of top Chemistry Questions on Aldehydes, Ketones and Carboxylic Acids asked in AFMC

Which of the following compounds when heated with $CO$ at $150^{\circ} C$ and $500$ atm pressure in presence of $BF _{3}$ forms ethyl propionate ?

Which of the products is formed when acetone is reacted with barium hydroxide solution?

Ketones react with $Mg - Hg$ over water gives :