Name and draw the displayed formulae of the unbranched esters which can be made from unbranched alcohols and carboxylic acids, each containing up to four carbon atoms

Write and interpret general formulae of compounds in the same homologous series, limited to: (a) alkanes, (C_nH_{2n+2}) (b) alkenes, (C_nH_{2n}) (c) alcohols, (C_nH_{2n+1}OH) (d) carboxylic acids, (C_nH_{2n+1}COOH)