# Which of the following is most reactive diene?

$\begin{array}{1 1}a)\;Naphthalene\\b)\; Anthracene\\c)\; Phenanthrene\\d)\; Benzene\end{array}$

Except Antharacene all are fully aromatic dienes
In Antracene the dienes in centre ring is aliphatic and is more reactive .
Hence (b) is the correct answer.