Question

An ant sting contains :

• A. Lactic acid
• B. Oxalic acid
• C. Citric acid
• D. Methanoic acid

Hint:

The stinging sensation from an ant bite is largely due to an acid. This acid is {Methanoic Acid}, which is also commonly known as {Formic Acid}. (The name "formic" comes from the Latin word for ant, "formica"). Remember: Ant sting \(\rightarrow\) Formic Acid \(\rightarrow\) Methanoic Acid.

Answer 1

The Correct Option is D

Concept: Ant stings cause irritation and pain due to the injection of certain chemical substances into the skin. One of the primary irritants is an organic acid. Step 1: Identifying the acid in ant stings The main acidic component responsible for the pain and irritation from most ant stings is methanoic acid. Methanoic acid is the systematic IUPAC name for this acid. Its common name is formic acid. The chemical formula for methanoic acid (formic acid) is \(\text{HCOOH}\). Step 2: Analyzing the options
(1) Lactic acid (\(\text{CH}_3\text{CH(OH)COOH\)):} Produced during anaerobic respiration in muscles (causing muscle fatigue) and by bacteria in milk fermentation (e.g., in yogurt). Not the primary component of ant stings.
(2) Oxalic acid (\((\text{COOH})_2\)): Found in some plants like rhubarb and spinach. It is toxic in larger quantities. Not the primary component of ant stings.
(3) Citric acid (\(\text{C}_6\text{H}_8\text{O}_7\)): Found in citrus fruits like lemons and oranges, giving them their sour taste. Not the component of ant stings.
(4) Methanoic acid (\(\text{HCOOH}\)): This is formic acid, which is the primary irritant in the stings of many species of ants and in nettle stings. Therefore, an ant sting primarily contains methanoic acid (formic acid).