# Why are allylic and benzylic radicals always more stable?

Jul 25, 2015

Benzylic and allylic radicals are more stable because they are stabilized by resonance.

#### Explanation:

Resonance involves a delocalization of electron density, and any process that delocalize electrons lowers the energy of a system.

(from www.mhhe.com)

We can write two equivalent resonance structures for the allyl radical, so its energy is lower than that of, say, a propyl radical.