Which of the following is not an electrical conductor?

Some liquids conduct electricity well while others conduct poorly. The majority of electrically conducting liquids are solutions of acids, bases, and salts, in their watery medium, they conduct electricity (dissolve in water).

Vinegar is the colloquial term for acetic acid, which breaks down into ions in an aqueous media.

Lemonade or Lime juice is formed of citric acid, which dissolves into its ions in water.

In the aqueous medium, salt is also broken down into its constituent ions.

Pure Distilled water is salt-free and a poor conductor of electricity.

As a result, it is evident that distilled water is not an electrical conductor.

Therefore, the required option is "Pure distilled water".