At room temperature, thiophene is a colorless liquid with a mildly pleasant odor reminiscent of benzene, with which thiophene shares some similarities.

What are the properties of thiophene?

Thiophene is a colourless liquid, boiling point 84 C, with an odour very similar to that of benzene. It is insoluble in water, but miscible with most organic solvents. Thiophene is 300 times more reactive than benzene.

Why does it smell like ozone outside?

The scent of ozone heralds stormy weather because a thunderstorm's downdrafts carry O3 from higher altitudes to nose level. Once the rains arrive, other odors come with them. Falling water disturbs and displaces odoriferous molecules on surfaces, particularly on dry ones, and carry them into the air.