An arsinic acid is an acid, formula H2As(=O)OH, or any of its hydrocarbyl derivatives.

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There is no chemical compound or element with the name "arsinic." It may be a typo or missing a letter. If you meant arsenic, it is a naturally occurring element that is toxic to humans and animals, commonly found in the environment due to industrial activities and pollutants.

Arsenic can be used as a weed killer-it is often sprayed from airplanes over cotton fields to destroy boll-weevil infestations.Also is used as a wood preservative, giving a characteristic green tint. It can be used as a poison and produce useful medical products.