Question

The least stable radical among the following radicals is :

• A.
• B.
• C.
• D.

Answer 1

The correct option is D

Stability of a free radical depends on number of $\alpha$ hydrogens
In option A : 6 $\alpha$ hydrogens
In option B : 9 $\alpha$ hydrogens
In option C : 3 $\alpha$ hydrogens
In option D : 0 $\alpha$ hydrogens
So, methyl free radical, i.e. option D is the least stable.