Question

Which of the following free radical is most stable?

• A. $\begin{array}{c}C{H}_3-\stackrel{\stackrel{H}{|}}{\underset{\underset{C{H}_3}{|}}{C^{\cdot }}}\end{array}$
• B. $\begin{array}{c}C{H}_3-\stackrel{\stackrel{C{H}_3}{|}}{\underset{\underset{C{H}_3}{|}}{C^{\cdot }}}\end{array}$
• C. $\begin{array}{c}{}^{\cdot }C{H}_3\end{array}$
• D. $\begin{array}{c}C{H}_3-\stackrel{\cdot }{C}{H}_2\end{array}$

Answer 1

The correct option is B $\begin{array}{c}C{H}_3-\stackrel{\stackrel{C{H}_3}{|}}{\underset{\underset{C{H}_3}{|}}{C^{\cdot }}}\end{array}$

$\begin{array}{c}C{H}_3-\stackrel{\stackrel{C{H}_3}{|}}{\underset{\underset{C{H}_3}{|}}{C^{\cdot }}}\end{array}$
is most stable due to the presence of the highest number of $\alpha$-H i.e. 9.