The ratio of \(\sigma\) bonds to \(\pi\) bonds in Q is
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The oxidation of phenols can give different products depending on the reagent. Strong oxidants like chromic acid (prepared from Na\(_2\)Cr\(_2\)O\(_7\)/H\(_2\)SO\(_4\)) oxidize phenol to p-benzoquinone. Milder oxidation or exposure to air can lead to complex colored polymers.