While writing the IUPAC name of this compound, what will we consider as principal part : benzene ring or carbon chain part because the one having the highest no. of carbon atoms has to be chosen as principal part, and here benzene ring has 6 C atoms and carbon chain part has 5 C atoms?

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The carbon chain part should be considered as parent chain as its the longest chain with a functional grp (ester) on it. 
 Although benzene has 6 c atoms, it doesnt have a functional grp on it (NO2 doesnt come in the priority sequence)
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