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Explain the un-ionized form of vanillin
It is the un-ionized form of vanillin that has the typical odor. In NaOH solution, the phenol group ofvanillin ionizes to its conjugate-base phenoxide ion; because vanillin is no longer present, and because ionic compounds like the conjugate-base phenoxide are not volatile, the odor disappears. (A compound has to be volatile-that is, it must have a significant vapor pressure-to enter the gas phase and therefore reach the nostrils.) Acidification of the solution brings about protonation of the phenoxide and regeneration of vanillin and, as, the characteristic odor.
Molecule in itself is electrically stable so it cant act as ligand So that it can acts as the negative and pasitive ligand.
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