50 points + brainliest to whoever is right

which of the following is not true about percent yield?
percent yield is often less than 100%
percent yields measures the efficiency of a reaction carried out in a lab
percent yield of 100% is unlikely when reactants or products were no carefully measured
percent yield is the ratio of theoretical yield to actual yield expressed as a percent

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.