$o-, m$ - and $p$ - cresol all contain phenolic group, thus they give violet colouration with $FeCl _{3}$ whereas benzylalcohol and methyl phenyl ether donot contain phenolic group, hence give no colouration with $FeCl _{3}$. Hence the pair of compounds which are identifiable by $FeCl _{3}$ is o-cresol and benzyl alcohol.
Alcohol is a derivative of water (H2O) that has one, two, or more hydroxyl groups that are attached to a carbon atom of a hydrocarbon chain (an alkyl group). It is one of the most common organic compounds used in sweeteners, fragrances, and medicine.
Ethanol is the alcohol used in alcoholic drinks. It can be used as an industrial methylated spirit where methanol is used very little in quantity as it can be dangerous.
It is used as fuel to produce carbon dioxide and water by the process of fermentation. Whereas methanol burns carbon dioxide and water to facilitate combustion.
Alcohol is an organic compound used as a solvent that is insoluble in water.
It can be used to lower the level of sugar.
Alcohol is used as a preservative in laboratories.
