Question

Which free radical is the most stable

Answer 1

→ The one which has low reactivity and high bond dissociation energy.

The property of free radicals is being unstable due to lack of paired electrons.

• The stability of free radicals depends upon the bonding strength/Dissociation energy of C — H bond ,

For example here is the arrangement of

• Secondary radical is mire stable than Primary radical.
• Tertiary radical is more stable than Secondary radical.
• Allylic radical more stable than Tertiary radical.
• Benzylic radical is more stable than Allylic radical.