A radical is a reactive intermediate with a single electron, formed by of a covalent bond. Allylic radicals are stabilized by , making them stable than tertiary radicals. A compound that contains an especially weak bond that serves as a source of radicals is called a radical . Treatment of cyclohexene with N-bromosuccinimide in the presence of light leads to by intermediates.

1. A radical is a reactive intermediate with a single electron, formed by of a covalent bond.

1. A: Unpaired, and homolysis

2. Allylic radicals are stabilized by , making them stable than tertiary radicals.

2. A: Resonance, and more

3. A compound that contains an especially weak bond that serves as a source of radicals is called a radical .

3. A: Initiator

4. Treatment of cyclohexene with N-bromosuccinimide in the presence of light leads to by intermediates.

4. A: Allylic substitution by radical

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