Answer
The formula C7H16 shows that there should be no degree of unsaturation in the isomers, meaning there should be no rings, double bonds, or triple bonds. This is because the number of hydrogens is 2 more than twice the number of carbons (2x7+2=16).
Work Step by Step
Possible isomers of C7H16 can have a parent chain of 7,6,5, or 4 carbons. Carbons and hydrogens not in the parent chain will be substituents. See image.