How it is possible to rank radical stability?

1 Answer
Dr. Hayek
Oct 2, 2015

The stability of radicals on the carbon atom increase with the increase of its degree (1^(st), 2^(nd) and 3^(rd)).

Explanation:

The stability of radicals on the carbon atom increase with the increase of its degree (1^(st), 2^(nd) and 3^(rd)).

For example, R_3C* is more stable than R_2HC* which is more stable than RH_2C*.
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Alkyl groups are consider electron donating groups through inductive effect , and this will increase the stability of the radical in a similar way the stabilizes a carbocation.

Image source: Organic Chemistry-Janice Gorzynski Smith 3rd Ed .

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