Consider the radicals shown below: 

Sort the radicals in order of decreasing stability. Determine if they are a tertiary, secondary, or primary radical.

(i) primary radical > (ii) secondary radical > (iii) tertiary radical > (iv) tertiary vinyl radical

(iv) tertiary vinyl radical > (iii) tertiary radical > (ii) secondary radical > (i) primary radical

(ii) primary radical > (i) secondary radical > (iv) tertiary radical > (iii) secondary vinyl radical

(iii) secondary vinyl radical > (iv) tertiary radical > (i) secondary radical > (ii) primary radical