The presence of the H+ ion in water determines whether a substance is acidic or non-acidic. Acids are substances that produce hydrogen ions when they dissociate with water. As some chemicals dissolve in an aqueous solution, hydrogen ions are produced, giving them an acidic property (acids like HCl, HNO3).
Although compounds like glucose and alcohol include hydrogen, they do not have an acidic character. The hydrogen in them does not separate as easily as the hydrogen in acids. When they dissolve in water, they will not split into hydrogen ions.
Why do HCl, HNO3, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?