[[1]] acid is present in the stinging hair of nettle leaves.

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Detailed Solution

Concept- Formic acid is present in the stinging hair of nettle leaves. Stinging nettle is a common plant that grows mainly in moist, fertile soil.
Nettle has sharp hairs on its leaves. These hairs contain chemicals such as formic acid and histamine that can irritate the skin and cause stinging, itching and redness. Nettle hairs also contain a number of other chemicals that can affect humans, including acetylcholine and serotonin.
Therefore, the acid present is formic acid. The IUPAC name of formic acid is methanoic acid, which is a carboxylic acid and is colourless liquid with pungent odour.
Hence, the answer is formic acid.

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