Butanone is a four-carbon compound with the functional group:

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?

What is the name of the aldehyde corresponding to methane?

Which of the following is a natural polymer?

State whether the following statement is true or false:
Heating ethanol at $443 \,K$ with excess concentrated sulphuric acid results in the dehydration of ethanol to give ethene.

Why is hard water not suitable for washing clothes with soap?