IR and NMR as tools to indicate a successful reaction .stretch(es) would see in the starting material, but not in the product, or vice versa. wavenumber ranges for the peaks is vanillyl alcohol lacks the peak about the 1700 cm⁻¹. range 9.5 - 10 ppm.
In the IR and NMR: The vanillyl alcohol lacks the peak of 1700 cm⁻¹ from C double bond O . the range is 9.5 - 10 ppm. IR tells the functionality present in the given product or the reactant.
Thus, IR and NMR as tools to indicate a successful reaction .stretch(es) would see in the starting material, but not in the product, or vice versa. wavenumber ranges for the peaks is vanillyl alchol lacks the peak about the 1700 cm⁻¹.
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