IIT JEE , AIEEE Forum - Chemistry , Organic Chemistry

hellomrranjay

Is there any formula to find out the number of structural isomers possible for hydrocarbons?

nigitha_17

there is no such formula al u need to do is write one structure imagine al those first by changin the position of functional group then change the structure of chain n again imagine the func iso mers..........til u get back the same repeadted structure

then go for functional isomers if they exist n then for metamers.......

ramyadiamond

For simple saturated hydrocarbons, u'll have to make different structures. But when there is any double or triple bond, i.e. when u know the degree of unsaturation, then u can make different structures(i.e. ring, or double or triple bongds in the structure) acc. to the given info.

nitansh

You can only calculate D.B.E. value, which could give a hint of no of possible isomers.

madhusudan.chavan

There is no formula for structural isomers.

But u can work out structural isomers of various hydrocarbons starting from propane, replace prm. & sec. hydrogen by methyl group u will get two isomers of butane . Similarly replace prim,sec,tert, H by methyl group and u will get isomers of pentane. Like this go on working out. Try to write 9 isomers of heptane &25 isomers of decane.

Ask & Discuss Questions with Community & Experts