Final answer:
The C=O bond in methyl urethane represents a multiple bond, specifically a double bond, while the other options, C-C, C-N, and C-H, are typically single bonds and not considered multiple bonds.
Step-by-step explanation:
To answer the question on which bonds in the 3D representation of methyl urethane are multiple bonds, we need to identify bonds that involve more than one pair of shared electrons, such as double or triple bonds. Based on the description provided and standard organic chemical structures, the C=O bond represents a double bond. This is because in common organic molecules, oxygen atoms are often double-bonded to carbon. The C-C, C-N, and C-H bonds are typically single bonds, and therefore they would not be considered multiple bonds.
Looking at the provided descriptions and figures related to methyl isocyanate, which is a similar molecule to methyl urethane, we could infer that the carbon atom on the left with four bonds is tetrahedral and those bonds are single. The carbon atom on the right in methyl isocyanate has two double bonds, which is a distinct characteristic from single-bonded carbon atoms. So in the context of methyl urethane, we would be looking for a linear arrangement around the carbon atom to find a double bond such as C=O.