HCOOCH (methyl formate), CH₂ (methylene), and H₂O (water) are common compounds in organic chemistry. Methyl formate is an ester with a sweet smell, CH₂ is a reactive carbene intermediate, and H₂O is essential for life. Their reactions often involve hydrolysis, combustion, or substitution depending on the experimental conditions. https://edulearnx.com/hcooch-ch2-h2o-role-mechanism-applications/