What is formed when methanol reacts with carbon monoxide in the presence of an $I_2-Rh$ catalyst?

Which is the simplest compound of the ketone group?

Which of the following monomers is used in the synthesis of polythene?

Unsaturated hydrocarbons contain multiple bonds between two $C$ atoms and show addition reactions. Give the test to distinguish ethane from ethene.

Write true or false for the following statement:
Saturated hydrocarbons will generally give a clean flame,while unsaturated carbon compounds will give a yellow flame with lots of black smoke.

Name the reaction which is commonly used in the conversion of vegetable oils to fats. Explain the reaction involved in detail.