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The reaction A 2 + B 2 → 2 AB follows the mechanism A 2 k 1 k –1 A + A (fast) A + B 2 ⎯→ ⎯ 2 k AB + B (slow) A + B → AB (fast) The overall order of the reaction is :

1. 1.5
2. 3
3. 2.5
4. 2

Correct answer: 1.5

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