Which gas has a sweet odor?

Vinyl chloride is known for its distinct sweet odor, which is a characteristic feature of this chemical compound. This sweet smell can often be associated with various industrial applications, as vinyl chloride is primarily used in the production of polyvinyl chloride (PVC). Understanding the odor characteristics of gases is crucial for safety and identification in various environments, especially when it comes to handling or working with chemicals.

While other gases listed, such as ethylene, propane, and carbon monoxide, have their own distinct properties, they do not exhibit a sweet odor in the same way that vinyl chloride does. For instance, ethylene has a faint, sweet scent but is not commonly noted for being sweet, and propane is often described as having a slight odor but is typically associated with a more pungent smell due to added odorants for safety. Carbon monoxide is odorless and colorless, which makes it particularly hazardous as it cannot be detected without specialized equipment.