Describe the colours,smell,and physical state of aliphatic carboxylic acids.

(N/A) The first three members of aliphatic carboxylic acids ($HCOOH$,$CH_3COOH$,and $CH_3CH_2COOH$) are colourless liquids with a pungent,sharp smell.
Aliphatic carboxylic acids containing $4$ to $9$ carbon atoms are colourless liquids at room temperature with an unpleasant,rancid odour.
Higher carboxylic acids (containing more than $9$ carbon atoms) are wax-like solids and are practically odourless due to their low volatility.