Draw the structure, name them and count them. C6H14− hexane.
(i) hexaneCH3−CH2−CH2−CH2−CH2−CH3
(ii) 2 - methyl pentaneCH3−CH∣CH3−CH2−CH2−CH3
(iii) 3 - methyl pentaneCH3−CH2−CH∣CH3−CH2−CH3 ∴ Total of 5 isomeric hexanes are possible.