Which substance is produced by the oxidation of methanal in the presence of an oxidising agent?

Write true or false for the following statement:
Esters react in the presence of an acid or a base to give back the alcohol and carboxylic acid.

Why are vegetable oils considered healthy compared to vegetable ghee? How are vegetable oils converted into vegetable ghee? Name and define the process involved.

An organic compound $A$ of molecular formula $C_{2}H_{4}$ on reduction gives another compound $B$ of molecular formula $C_{2}H_{6}$. $B$ on reaction with chlorine in the presence of sunlight gives $C$ of molecular formula $C_{2}H_{5}Cl$.
$(a)$ Name the compounds $A, B$ and $C$.
$(b)$ Write the chemical equation for the conversion of $A$ to $B$ and name the type of reaction.

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

Which polymer is used for making nonstick cooking vessels?