The total number of structural isomers in ortho methyl phenol are:

Concept: Structural isomers are compounds that have the same molecular formula but different arrangements of atoms. In the case of ortho methyl phenol, we are looking at isomers of phenol with a methyl group attached to different positions on the benzene ring relative to the hydroxyl (-OH) group.

In ortho methyl phenol, the -CH₃ group is adjacent to the -OH group on the benzene ring. Let's understand the isomer possibilities:

1. Ortho Methyl Phenol: The -CH₃ group is directly next to the -OH group.

2. Meta Methyl Phenol: The -CH₃ group is one carbon away from the -OH group.

3. Para Methyl Phenol: The -CH₃ group is opposite to the -OH group on the benzene ring.

In addition to the above isomers, other compounds like anisole (methoxybenzene) and benzyl alcohol (phenylmethanol) are not considered here because they involve different functional groups or attachments, which do not match the molecular formula of ortho methyl phenol.

The total number of structural isomers of ortho methyl phenol is 3, corresponding to ortho methyl phenol, meta methyl phenol, and para methyl phenol.