Question

Why e from primary suffix is not dropped in hexane-2 5-dione?

Answer 1

2,5-Hexanedione is an aliphatic diketone. In humans, it is a toxic metabolite of hexane and of 2-hexanone. 

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Answer 2

Answer:

in the primary suffix e is not dropped because the secondary suffix "Dione" starts with a consonant 'd' and not with any vowel therefore e is retained