(i)they have the same general formula represented by R-COOH where R is an alkyl group.

(ii)each member differ by –CH2- group from the next/previous.

(ii)they show a similar and gradual change in their physical properties e.g. boiling and melting point.

(iii)they show similar and gradual change in their chemical properties.

(iv) since they are acids they show similar properties with mineral acids

the first ten alkanoic acids are;

draw the structural formular of butanoic acid