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I have tried all I could for this question the answer I reached is 7 as in the attached pic but the book says 6
You can put Br and Cl in the same carbon. In 1-bromo-1-chloro-pent-1-en-3-one , p1+p2+p3+p4 is equal to 6. I think this is the smallest p1+p2+p3+p4 which can be reached according to IUPAC rules of nomenclature.