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In adsorption column chromatography ,We can't use alumina as adsorpent when seprate compounds containing phenolic or...

In adsorption column chromatography ,We can't use alumina as adsorpent when seprate compounds containing phenolic or carboxylic groups, WHY?
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In adsorption chromatography, separation of chemical mixture is achieved by the interactions taking place on the surface of the adsorbent. These interactions can be dipole-dipole, hydrogen bonding, weak covalent bonding or van der waal interactions. We can not use Alumina when separating acidic compounds like phenolic and carboxylic acids since they react chemically with the alumina.Adsorption in alumina is due to strong positive field of Al+3ions and the influence of basic sites on its surface.

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