Key Concepts—Radical Reactions

The weaker the C—H bond, the more readily the hydrogen is replaced by X. Chlorination is faster and less selective than bromination (15.6). 

Radical substitution at a stereogenic center results in racemization (15.8). 

CH2= CHCHgBr The reaction follows a radical chain mechanism, aliyiic haiide j 

36 Rank each group of radicals in order of increasing stability. 

38 Rank the indicated hydrogen atoms in order of increasing ease of abstraction in a radical halogenation reaction. 

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