Thorough understanding of the difference between alcohols, phenols, ether, naming them according to the IUPAC system of nomenclature, the different reactions they undergo during preparation is mandatory. Phenols and alcohols can be classified as monohydric, dihydric, trihydric, polyhydric, etc. based on the number of hydroxyl groups present in their structure. When the OH group is attached to the primary carbon atom, it is called primary alcohol. When the OH group is attached to a secondary carbon atom, it is called secondary alcohol. When the OH group is attached to tertiary carbon, then it is called tertiary alcohol.
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