Number of Pi -bonds (Z):
Z= (2A-B)/2 +1
Where,
A = number of carbon atoms
B = number of hydrogen atoms
Z =
number of Pi
-bonds (Z):
Example: C176H250
A = 176,
B = 250,
Z= (2A-B)/2 +1
Z= 2*176-250/2 +1
Hence , Z= 52
Note: This formula is applicable for simple open
chain unsaturated hydrocarbon
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