Nettle sting and bee-sting have methanoic acid commonly called formic acid (HCOOH).The leaves and young stems of this herbaceous plant are fitted with stinging hairs tipped with formic acid and other irritants.If touched, these needle-like hairs inject the stinging acid into the skin, triggering a burning, tingling sensation and an itchy rash.So, the bee sting contains methanoic acid that causes pain and irritation.Additional InformationAcetic Acid:Chemical formula:- CH3COOH.IUPAC name:- Ethanoic acid Anhydrous Acetic acid is called Glacial Acetic acid.Its crystals are obtained at a temperature slightly lower than 16.7°C. Sulphuric Acid:It is commonly known as King of Chemicals.it is used in the preparation of a very large number of other useful chemicals such as hydrochloric acid, nitric acid, dyes, drugsSulfuric acid is used in the production of fertilizers, e.g., superphosphate of lime and ammonium sulfate.It is also used as an electrolyte in lead-acid batteries.Citric acid:The fruits containing citric acid are termed citrus fruits. eg: lemon, orange, grapefruit, etc.These are sour in taste and are a good source of Vitamin C, thus help in preventing the disease caused by the deficiency of Vitamin C, i.e., Scurvy.