Question

How to find number of isomers of any functional isomers?

Answer 1

We can calculate the number of structural isomers by double bond equivalent i.e by using the formula:

1+∑ini(vi−2)

wheren repesents the number of atomsiiof a given valency, andvirepresents these atoms’ valency. Example:

C4H6:1+∑ini(vi−2)2=1+4(4−2)2+6(1−2)2=8−62+1=2CX4HX6:1+∑ini(vi−2)2=1+4(4−2)2+6(1−2)2=8−62+1=2 Thus the compound may contain two double bonds or a triple bond and there are two possible isomers.