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Priyanshu kumar Best Answer
Option A is correct
azulene and napthalene both have 7 degree of unsaturation
In both azulene and napthalene 5 double bonds and 2 rings are present..So 7 degree of unsaturation
compound C tetralin 5 degree of unsaturation ...3 double bonds and 2 rings
In compound D...4 rings means 4 DOU
So option A is correct