Answer
No, an aldehyde with the formula C$_{8}$H$_{16}$O should not be soluble in water.
Work Step by Step
An aldehyde with the formula C$_{8}$H$_{16}$O should not be soluble in water because a hydrocarbon chain of eight carbons will reduce the impact of solubility in the polar carbonyl group, reducing the solubility of this aldehyde.