This video explains how to write isomers of C4H9Br easily. The compounds having Same molecular formula but different structural formula are called isomers. Structural isomers Chain isomers, position isomers, metamers & functional isomers belong to structural isomers. Follow the given guidelines to write structural isomers of any compounds. 1. Start with parent chain of given carbon number 2. Try to make possible isomers by maintaining the same number of carbon containing parent chain 3. When it is not possible to make further isomers, reduce one C-atom from parent chain & add one methyl group instead & continue the same 4. Please make sure that not to repeat the same structures !!! There are 4 structural isomers for C4H9Br.