Which of the following is comparatively poor conductor of electricity?

Distilled water

The correct answer is option 4. Distilled water.

The water that we get from sources such as taps, hand pumps, wells and ponds is not pure.

It may contain several salts dissolved in it. Small amounts of mineral salts are naturally present in it. This water is thus a good conductor of electricity.

On the other hand, distilled water is free of salts and is a poor conductor.