begin mathsize 36px style D B E space equals space C plus 1 minus H over 2 minus X over 2 plus N over 2 end style 

C= Number of Carbon atoms present ; H = Number of Hydrogen atoms present; X= Number of Halogen atoms present (Cl, Br, I or F);
N= Number of Nitrogen atoms present; DBE = Double bond equivalent a.k.a Level of Unsaturation

Write the formula of an Organic Compound by changing the coefficients below 


DBE or double bond equivalent a.k.a LU or level of unsaturation is the number of unsaturations present in a organic molecule. The term unsaturation mean a double bond or a ring system. For instance , in benzene there are 3 double bonds and 1 ring which gives us 4 DBE. Moreover a tripple bond can be regarded as DBE=2. It must be noted that X is the total number of halogens, namely Cl, Br, F and I present in the structure. Presence of an oxygen atom does not effect the DBE calculation.       

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