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The hydrolysis of tert-butyl chloride in aqueous solution follows which rate law? Choose the correct option.

medium MCQ 3 marks Class 12 · Chemistry · Haloalkanes and Haloarenes
  1. rate = k[tert-butyl chloride][H2O]
  2. rate = k[tert-butyl chloride]
  3. rate = k[H2O]
  4. rate = k[tert-butyl chloride]^2
Answer
rate = k[tert-butyl chloride]

The correct answer is rate = k[tert-butyl chloride] — Write the rate law as rate = k[tert-butyl chloride].

Step-by-step solution

  1. Recognize that tert-butyl chloride undergoes an SN1 reaction in water.
  2. In SN1, the rate-determining step is the formation of the carbocation after loss of Cl⁻.
  3. The rate therefore depends only on the concentration of the alkyl halide.
  4. Write the rate law as rate = k[tert-butyl chloride].
Common mistake: Including the concentration of water in the rate expression.

Concept tested: Rate law for SN1 reaction

Published · How this solution was prepared and checked

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