What is the functional group of a carboxylic acid?‒C=C‒COO‒COOH‒OH2What products are formed when butanoic acid is added to a solution of potassium carbonate?Potassium butanoate + water + oxygenPotassium oxide + water + carbon dioxidePotassium butanoate + water + carbon dioxidePotassium butanoate + water + hydrogen3Carboxylic acids are weak acids. What does this mean?They fully dissociate into ions when dissolved in water and the change is not reversibleThey partially dissociate into ions when dissolved in water and the change is not reversibleThey fully dissociate into ions when dissolved in water and the change is reversibleThey partially dissociate into ions when dissolved in water and the change is reversible4In the presence of a strong acid catalyst, carboxylic acids react with compounds in which homologous series to form esters?AlkanesAlcoholsHalogensAlkenes5Which of the following is the correct structural formula for the ester ethyl ethanoate?CH3CH2OHCH3COOCH2CH3 CH3COOHCH3CH36Which of the following is a use for esters?In margarineAs food flavouringsAs fuelIn vinegar