What is the monomer unit of Teflon?

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?

Draw the structure of the simplest ketone.

Explain why washing clothes with hard water is not effective.

What is the percentage of sulfur used in vulcanized rubber for battery casings (in $\%$)?

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