Nonelectrolytes fail to ionize or dissociate in water because:

• A. they react with water to form gases instead of ions
• B. their molecules do not contain ions or polar groups that can separate in water
• C. they are always insoluble in water
• D. they are composed entirely of ionic bonds

Answer: (B)

Verified step by step guidance

1. Understand the nature of nonelectrolytes: Nonelectrolytes are substances that do not produce ions when dissolved in water, meaning they do not conduct electricity in solution.
2. Recall that ionization or dissociation in water requires the substance to have ionic bonds or polar groups that can interact with water molecules and separate into ions.
3. Recognize that nonelectrolytes typically consist of molecules that are either nonpolar or lack charged groups, so they do not separate into ions upon dissolution.
4. Eliminate incorrect options: Nonelectrolytes do not react with water to form gases, are not necessarily insoluble, and are not composed entirely of ionic bonds (which would make them electrolytes).
5. Conclude that the correct reason nonelectrolytes fail to ionize or dissociate in water is because their molecules do not contain ions or polar groups that can separate in water.