This problem is actually easy to solve. You can just search this as what I have done. The isomers of C₅H₁₀O are shown in the attached picture. They are called isomers because they have the same chemical formula, but different in their structural formula. The isomers can be grouped as ketone or aldehyde. Those ending in -one are ketone which has a formula of RC=OR, where R is a hydrocarbon chain. Those ending in -al are aldehydes which has a formula of RC=OH.
