Organic Chemistry – Some Basic Principles and Techniques · NEET Preparation Chemistry
The correct order of stability of the following free radicals is: (I) (CH3)3C (II) (CH3)2CH (III) CH3CH2 (IV) CH3
Practice question from Organic Chemistry – Some Basic Principles and Techniques (NEET Preparation Chemistry), with the correct answer and a step-by-step solution.
easy · MCQ · Q-6E1853
The correct order of stability of the following free radicals is: (I) (CH3)3C* (II) (CH3)2CH* (III) CH3CH2* (IV) CH3*
- A.I > II > III > IVCorrect answer
- B.IV > III > II > I
- C.II > I > III > IV
- D.I > III > II > IV
Solution
Alkyl free radicals are stabilized by hyperconjugation and inductive effect, similar to carbocations. Tertiary radical has 9 alpha-hydrogens, secondary has 6, primary has 3, and methyl radical has 0. Therefore, the stability order is tertiary > secondary > primary > methyl.
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