Tricks to find number of pi bond

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