Answer
2,2-difluoropropan-1-ol
Work Step by Step
The presence of electron withdrawing halogens makes the corresponding ion more stable. 2,2-difluoropropan-1-ol is more acidic than 2,2-dichloropropan-1-ol because it has fluorine. Fluorine is more electronegative than chlorine as a result it withdraws electrons more strongly than chlorine, resulting in a more stable compound and thus better acidity.