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The graph which represents the following reaction is: (C6H5)3C–Cl OH− / Pyridine (C6H5)3C–OH

1. rate vs [OH−] is a straight line through origin
2. rate vs [(C6H5)3C–Cl] is a straight line through origin
3. rate vs [Pyridine] is a straight line through origin
4. rate vs [(C6H5)3C–Cl] is a horizontal line

Correct answer: rate vs [(C6H5)3C–Cl] is a straight line through origin

Solution

The reaction is first-order with respect to the substrate (C6H5)3C–Cl, meaning that the rate of the reaction is directly proportional to the concentration of (C6H5)3C–Cl. Therefore, plotting the rate against the concentration of (C6H5)3C–Cl yields a straight line through the origin.

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