Which of the following does not conduct electricity?Sugar solutionVinegar solutionLemon juice solutionCaustic soda solution

To determine which of the given solutions does not conduct electricity, we need to understand the properties of each solution.

1. Sugar solution: Sugar is a non-electrolyte, meaning it does not dissociate into ions when dissolved in water. Therefore, a sugar solution does not conduct electricity.

2. Vinegar solution: Vinegar is a weak electrolyte, meaning it partially dissociates into ions when dissolved in water. As a result, a vinegar solution can conduct electricity, although not as effectively as a strong electrolyte.

3. Lemon juice solution: Lemon juice contains citric acid, which is a weak electrolyte. Similar to vinegar, a lemon juice solution can conduct electricity to some extent.

4. Caustic soda solution: Caustic soda, or sodium hydroxide, is a strong electrolyte. It completely dissociates into sodium ions (Na+) and hydroxide ions (OH-) when dissolved in water. Therefore, a caustic soda solution is a good conductor of electricity.

Based on this information, the solution that does not conduct electricity is the sugar solution.