Quercetin and morin have the same molecular formula (C15H10O7). Quercetin is 2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4H-chromen-4-one while morin is 2-(2,4-dihydroxyphenyl)-3,5,7-trihydroxychromen-4-one, so they differ only in the positions of the two hydroxy groups of the B ring of flavonoids (quercetin is 3,4 while morin is 2,4).
You can test them by solubility .but in general I think quercetin (2-(3,4-dihydroxy phenyl) -3,5,7-trihydroxy-4H-chromen-4-one more solubile than morin ( 2-(2,4-dihydroxyphenyl)-3,5,7-trihydroxychromen-4-one.
Morin is more water soluble as it has less intramolecular bonding than quercetin. The calculated log p for quercetin and morin are same using Chem draw but the clogP are different. The clogP of the quercetin is more than morin. I do agree with asnwer of Andreas.
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