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a

Double Bond Equivalent

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What is the DBE[double bond equivalent] formula? Just for clarification?

I have two sets of lecture notes ...

one says its : 1+d (a-c) / 2

and the other says its : 1+d (c-a) / 2

a = number of atoms with a valence of 1 (H, F, Cl).

b = number of atoms with a valency of 2 (O, S).

c = number of atoms with a valency of 3 (N, P).

d = number of atoms with a...