Which of the following does not belong to the same homologous series?

Write three different chemical reactions showing the conversion of ethanoic acid to sodium ethanoate. Write balanced chemical equations in each case. Write the name of the reactants and the products other than ethanoic acid and sodium ethanoate in each case.

The general formula of three compounds $A, B$ and $C$ is $C_{n}H_{2n}$. $B$ has the highest boiling point and $C$ has the lowest boiling point.
$(i)$ Mention the type of compound $A, B$ and $C$.
$(ii)$ Which of these has the minimum number of carbon atoms?
$(iii)$ Name the homologous series to which $A, B$ and $C$ belong.

$(a)$ How is vinegar made?
$(b)$ What is glacial acetic acid? What is its melting point?
$(c)$ Why are carboxylic acids called weak acids?
$(d)$ Write the name and the formula of the two compounds formed when the ester $CH_{3}COOC_{2}H_{5}$ undergoes saponification.

Which substance is produced by the reduction of methanal in the presence of a palladium catalyst?

Which functional group is attached to the hydrocarbon chain in soap?