Final answer:
The substance with the greatest electrical conductivity among the 0.1 M solutions of NaCl, CH3OH, C6H12O6, and CH3COOH is NaCl, because it is a strong electrolyte that dissociates completely into ions.
Step-by-step explanation:
In the context of electrical conductivity in solutions, substances can be classified as electrolytes or nonelectrolytes. An electrolyte is a compound that dissociates into ions when dissolved in water, thus allowing the solution to conduct electricity. A nonelectrolyte does not dissociate into ions in solution and therefore does not conduct electricity.
Given the choices of 0.1 M solutions for NaCl, CH3OH, C6H12O6, and CH3COOH:
Thus, the substance that would have the greatest electrical conductivity in a 0.1 M solution is NaCl, because it is a strong electrolyte which dissociates completely in solution, providing a high concentration of ions to carry the electrical current.