Consider the radicals shown below: 

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

• A. (i) primary radical > (ii) secondary radical > (iii) tertiary radical > (iv) tertiary vinyl radical
• B. (iv) tertiary vinyl radical > (iii) tertiary radical > (ii) secondary radical > (i) primary radical
• C. (ii) primary radical > (i) secondary radical > (iv) tertiary radical > (iii) secondary vinyl radical
• D. (iii) secondary vinyl radical > (iv) tertiary radical > (i) secondary radical > (ii) primary radical

Answer: (B)