Ammonia is a pyramidal molecule with bond angles of about 107° and amines therefore have this same shape. Primary amines can hydrogen bond to each other. Shorter chain amines (methylamine, ethylamine) are gases at room temperature, those with slightly longer chains are volatile liquids with fishy smellsAmines with up to four carbon atoms are soluble in water and ethanol. Most amines are soluble in less polar solvents, but phenylamine is only sparingly soluble in water.The reactivity as bases depends on the base strength which in turn depends on whether the amine is aryl, primary, secondary or tertiary