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What is a cresol? and what are the different types of cresol?
It's a common name for a methylphenol or hydroxytoluene, take your pick.
There are only three cresols: o-cresol, m-cresol, and p-cresol, due to the symmetric nature of benzene. Their densities are similar. They each have a hydroxyl group and a methyl group.
These are ortho, meta, and para isomers, which indicate 1,2, 1,3, and 1,4 substitutions, respectively.