Which catalyst is used in the Fischer-Tropsch process to synthesize hydrocarbons or oxygenated compounds like propanone?

$A$ non-metal $A$ is an important constituent of our food and forms two oxides $B$ and $C$. Oxide $B$ is toxic,whereas $C$ causes global warming.
$(a)$ Identify $A$,$B$,and $C$.
$(b)$ To which Group of the Periodic Table does $A$ belong?

Look at the figure and answer the following questions:
$(a)$ If ethanol is used instead of ethanoic acid,would you expect the same change?
$(b)$ How can a solution of lime water be prepared in the laboratory?

Explain the given reactions with examples:
$(a)$ Saponification reaction
$(b)$ Combustion reaction

Which of the following is not a biopolymer?

Draw the electron-dot structure for ethyne. $A$ mixture of ethyne and oxygen is burnt for welding. In your opinion,why cannot we use a mixture of ethyne and air for this purpose?