Link the following radicals in order of decreasing stability

radicals-stability

#1

Link the following radicals in order of decreasing stability.
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Rank the following radicals in order of decreasing stability.

Concepts and reason
This problem is based on the concept of stability of free radicals.
Stability of free radicals depends on various factors like inductive effect, resonance, mesomeric effect etc. These factors are responsible for decreasing the electron deficiency in order to stabilize the free radicals.

Fundamentals
Free radicals are electron deficient. Thus, groups that provide some electron density to the free radicals make them more stable as compared to the radicals which lack such substituents.

Answer:

Structure of first compound is given below:

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Structure of second compound is given below:

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The structure of third compound is given below:

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The structure of fourth compound is given below:

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