Choose the statement which best describe ester :
Statement 1: Ester is formed due to the reaction between ethanol and Ethanoic acid.
Statement 2: Esters are sweet smelling substances.
Statement 3: Ester are formed due to the reaction between an acid and a carboxylic acid.
Statement 4: On treating with sodium hydroxide, ester is converted back to alcohol and sodium salt of carboxylic acid.
Statement 5: Preparation of soap involves treating sodium hydroxide with ester.