Which of the following is the least reactive diene in a Diels-Alder reaction? 
Definitions:
Tsunami
A series of ocean waves with extremely long wavelengths caused by large-scale disturbances of the ocean, such as earthquakes, volcanic eruptions, or underwater landslides.
P-Wave
A type of seismic wave that compresses and expands the ground, being the fastest kind of seismic wave and the first to be recorded by seismographs during an earthquake.
Velocity
The speed of something in a given direction.
Density
A physical property that describes the mass of a substance per unit volume.
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