Given the image shows a fused aromatic ring system with three rings in a linear arrangement, and the options are common polycyclic aromatic hydrocarbons, let's analyze the structure.

Step 1: Count the number of rings. The structure has three fused benzene rings.

Step 2: Observe the arrangement. The three rings are fused in a straight line, which is characteristic of anthracene.

Step 3: Compare with the options:
- Biphenyl: Two separate benzene rings connected by a single bond (not fused).
- Anthracene: Three fused benzene rings in a linear arrangement.
- Phenanthrene: Three fused benzene rings in an angular or bent arrangement.
- Naphthalene: Two fused benzene rings.

Final Answer: The compound J is Anthracene.

Related Topics

Polycyclic Aromatic Hydrocarbons (PAHs): Compounds with multiple fused benzene rings.
Aromaticity: The property of cyclic, planar structures with delocalized pi electrons that confer unusual stability.
Isomerism: Anthracene and phenanthrene are isomers (both C₁₄H₁₀) with different ring arrangements.

Formulae and Theory

The molecular formula for anthracene is $C_{14} H_{10}$ . It is an aromatic compound following Hückel's rule (4n+2 π electrons, where n=3 for 14 π electrons). Its structure can be represented as:

$Anthracene : C_{14} H_{10}$

Key reactions include electrophilic substitution, which occurs preferentially at the C-9 and C-10 positions (central ring) due to higher reactivity.