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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.
Total number of unpaired electrons in an atom of atomic number 29 is: (1) 1 (2) 3 (3) 4 (4) 2 Ans: 1
Assignment
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