For the generic reaction below, the rate quadruples when [A] is doubled. When [B] is doubled, the rate doesn’t change. Which mechanism is consistent with these experimental observations? 2 A + B → 2 C A. Step 1: A + B ⇌ D fast Step 2: A + D → 2 C slow B. Step 1: A + B → D slow Step 2: A + D ⇌ 2 C fast C. Step 1: 2 A → D slow Step 2: B + D → E fast Step 3: E → 2 C fast D. Step 1: 2 A ⇌ D fast Step 2: B + D → E slow Step 3: E → 2 C fast

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