Question

the compound butanol has the following structural formula. which of these is a structural isomer of butanol?

Explanation:

Step1: Recall definition of structural isomers

Structural isomers have same molecular formula but different structures. Butanol has the molecular formula $C_4H_{10}O$.

Step2: Analyze given structure

The given structure in the second - part is $C_4H_{10}$, which has a different molecular formula from butanol ($C_4H_{10}O$) as it is missing an oxygen atom. So it is not a structural isomer of butanol. Since no other options are given, we assume based on the information provided that there is no correct answer among the presented structures.

Answer:

There is no correct option among the given structures as the presented structure has a different molecular formula from butanol.