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Considering the rate law (rate = k[epoxide]) for the reaction shown below, the plausible intermediate is

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CSIR-UGC (NET) Chemical Science: Held on (18 Sept 2022)
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Option 3 :
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Detailed Solution

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Explanation:-

  • The epoxide ring opening mechanism follows SN1 pathway, in which epoxide undergoes ring opening to form the respective intermediate.

  • The rate order follows the following rate law,

rate = k[epoxide]

  • The last step of the reaction is not rate determining step of the reaction.

Conclusion:-

  • Hence, the plausible intermediate is

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