Final answer:
The bond order for the carbon-oxygen bond in CH3OH is 1, in CH3CHO it is 1, and in CO it is 3.
Step-by-step explanation:
The bond order for the carbon-oxygen bond can be determined by looking at the Lewis structure of the molecules.
In CH3OH (methanol), the carbon-oxygen bond is a single bond. Therefore, the bond order is 1.
In CH3CHO (acetaldehyde), the carbon-oxygen bond is also a single bond. So, the bond order is 1.
In CO (carbon monoxide), the carbon-oxygen bond is a triple bond. Hence, the bond order is 3.