Question

21 multiple choice 2 points which of the following radicals is the most stable? secondary radical quaternary radical tertiary radical primary radical

Explanation:

Step1: Recall radical - stability rule

Stability of radicals increases with substitution level.

Step2: Identify substitution levels

Primary has 1 - alkyl group, secondary has 2, tertiary has 3, and quaternary (if exists) would have 4.

Step3: Determine most stable

Since more alkyl groups stabilize the radical due to hyper - conjugation and inductive effects, quaternary radical (if applicable in the context) is the most stable among the given options.

Answer:

Quaternary radical