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Question
In the following reactions, if the rate of reaction of (I) and (II) are different, then, both reactions proceed by which mechanism?
In the following reactions, if the rate of reaction of (I) and (II) are different, then, both reactions proceed by which mechanism?
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Solution
The correct option is B E2
The given reactions are elimination reaction. In reaction (II), there is a abstraction of D while in reaction (I) there is a abstraction of H. Since, D shows isotopic effect the rate of abstraction of D will differ with rate abstraction of H of same base.
Hence, both the reaction are of different rate because mechanism depends on the abstraction of H/D by the base.
In E1 elimination mechanism, the rate of reaction depends only the carbocation formation step so it does not have the isotopic effect.
The given reactions are elimination reaction. In reaction (II), there is a abstraction of D while in reaction (I) there is a abstraction of H. Since, D shows isotopic effect the rate of abstraction of D will differ with rate abstraction of H of same base.
Hence, both the reaction are of different rate because mechanism depends on the abstraction of H/D by the base.
In E1 elimination mechanism, the rate of reaction depends only the carbocation formation step so it does not have the isotopic effect.
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