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2. Three compounds were found to have the same empirical formula that is the same number of carbons, hydrogens, oxygens, etc.; however, compound A absorbs at 268 nm, B at 278 nm, and C at 316 nm. What might you conclude about the structures of these three compounds [5 points]?
Ans. Compound A, B and C have same empirical formula but their absorption maximum is going towards higher wavelength that means they have increasing number of conjugation (alternating double bonds) when we go from compound A to C. Compound B have slightly increased conjugation than compound A but compound C has considerably higher conjugation than compound A and B because compound A, B and C have absorption maximum 268, 278 and 316 respectively, a higher difference in absorption maximum of compound B and C. In other words we can say that from compound A to C, structure is changing from isolated double bonds or less conjugated double bonds to conjugated or higher number of conjugated double bonds. We can also say that from compound A to C, chromophoric area is increasing....
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