The systematic naming of the following cycloalkane is:
6-methyl bicyclo [3.2.0] heptane
7-methyl bicyclo [3.2.0] heptane
2-methyl bicyclo [3.2.0] heptane
3-methyl bicyclo [3.2.0] heptane
The given structure -
The IUPAC name of the compound is 6-methyl bicyclo [3.2.0] heptane.
Therefore, option (1) is correct.