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The formation of HBr proceeds by ____

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The formation of HBr proceeds by ____

(a) Free radical, non chain reaction mechanism

(b) Free radical, chain reaction mechanism

(c) Molecular intermediates, non chain reaction mechanism

(d) Transition complexes, non chain reaction mechanism

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I would like to ask this question from Classification of Reactions in division Basic Concepts of Chemical Reaction Engineering

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The correct answer is (b) Free radical, chain reaction mechanism

To elaborate: Formation of HBr occurs via free radical mechanism. The Br. radical is first formed. It then combines with H2 to form HBr and another Br. radical.

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