Question #b418c

1 Answer
Dec 30, 2014

You can't. You need a structural formula to identify a peroxy group.

Consider the molecular formula C₂H₄O₃.

This could represent either hydroxyacetic acid

or peroxyacetic acid

or methyl peroxyformate


The latter two structures contain peroxy groups, but you need more information than the molecular formula to decide which compound you have.