Answer
Three compounds of formula $C_3H_{8}O$ and the condensed formulae are shown in the picture.
Work Step by Step
Arrange the 3 carbons and one oxygen in three different ways possible. Then add H around the Carbons. Count the H to make sure that they are 8. After drawing the structures, write the condensed formula corresponding to the structure. By starting on the left write down the elements the way they are connected.