Because hydrogen molecules present in alcohol and glucose do not ionise in aqeuos solution.moreover, in aqeuos solution alochol and glucose do not conduct electricity,this proves that glucose and alcohol do not possess acidic characteristics.

Acidic and Non-Acidic Compounds in Aqueous Solutions

Introduction
In aqueous solutions, certain compounds exhibit acidic behavior, such as hydrochloric acid (HCl) and nitric acid (HNO3), while others like alcohols and glucose do not. This difference in behavior can be attributed to the presence of hydrogen ions (H+) in the solution. The ability of a compound to release hydrogen ions determines its acidic character.

Definition of Acidity
Acidity is a measure of a compound's ability to donate protons (H+ ions). Acids are substances that can release H+ ions when dissolved in water. The release of H+ ions is responsible for the characteristic properties of acids, such as sour taste, ability to neutralize bases, and reaction with metals.

Acid Behavior of HCl and HNO3
1. HCl: In an aqueous solution, HCl dissociates into H+ and Cl- ions due to the polar nature of water. The H+ ions make the solution acidic by increasing the concentration of H+ ions.
2. HNO3: Similarly, HNO3 dissociates into H+ and NO3- ions in water, contributing to the acidic character of the solution.

Lack of Acidic Character in Alcohol and Glucose
1. Alcohol: Alcohols, such as ethanol (C2H5OH), do not exhibit acidic behavior in aqueous solutions. This is because the OH group in alcohols is bonded to a carbon atom, which makes it less likely to dissociate and release H+ ions. The OH group in alcohols is relatively weakly acidic compared to the HCl and HNO3 mentioned earlier.
2. Glucose: Glucose is a carbohydrate and does not possess any functional groups that can donate H+ ions. Therefore, it does not exhibit acidic behavior in aqueous solutions.

Conclusion
In summary, the acidic behavior of compounds in aqueous solutions is determined by their ability to release H+ ions. Compounds like HCl and HNO3 readily dissociate in water, releasing H+ ions and contributing to the acidic nature of the solution. On the other hand, compounds like alcohols and glucose lack functional groups that can easily donate H+ ions, resulting in their non-acidic behavior in aqueous solutions.