Understanding the Concept:
The name of an aromatic compound provides information about both the parent compound and the position of substituents.
Step 1: Understanding anisole.
Anisole is methoxybenzene.
Its structure is:
\[
C_6H_5OCH_3
\]
Thus, the benzene ring contains the methoxy group:
\[
-OCH_3
\]
Step 2: Understanding the term ``o-ethyl''.
The prefix ``ortho'' or ``o'' means that the substituent is attached adjacent to the main substituent.
Therefore, the ethyl group:
\[
-C_2H_5
\]
must be present at the adjacent carbon atom relative to the methoxy group.
Step 3: Conclusion.
Hence, \(o\)-ethyl anisole contains:
\[
-OCH_3 \text{ and } -C_2H_5
\]
at ortho positions.
Therefore, option (1) is correct.
