Chapter 15, Problem 16PE

List these acids in terms of increasing acidity: ${\text{CF}}_{\text{3}}{\text{CO}}_{\text{2}}{\text{H, CH}}_{\text{3}}{\text{CO}}_{\text{2}}{\text{H, CHF}}_{\text{2}}{\text{CO}}_{\text{2}}{\text{H, CH}}_{\text{2}}{\text{FCO}}_{\text{2}}\text{H}$