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For two reversible competing one-step reactions, A-Y and A-Z, how does the Y/Z ratio change with...

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Chemistry

For two reversible competing one-step reactions, A-Y and A-Z,how does the Y/Z ratio change with a) reaction temperature, b)reaction time if Y is the kinetic product and Z is thethermodynamic product? Please explain with the help of a reactionenergy diagram.

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4.1 Ratings (859 Votes)
When a reaction produces more than one product the product thatis formed most rapidly is called the kinetic product and the moststable product is called the thermodynamic productThermodynamic Versus Kinetic Control of ReactionsWhen a conjugated diene undergoes an electrophilic additionreaction two factorsthe temperature at which the reaction iscarried out and the structure of the reactantdetermine whether the12addition product or the 14addition product will be the majorproduct of the reaction When a reaction produces more than oneproduct the product that is formed most rapidly is called thekinetic product and the most stable product is called thethermodynamic product Reactions that produce the kinetic productas the major product are said to be kinetically controlledReactions that produce the thermodynamic product as the majorproduct are said to be thermodynamically controlledThe thermodynamic product is the most stable productFor many organic reactions the most stable product is the one thatis formed most rapidly In other words the kinetic product and thethermodynamic product are one and the same Electrophilic additionto 13butadiene is an example of a reaction in which the kineticproduct and the thermodynamic product are not the same The12addition product is the kinetic product and the 14additionproduct is the thermodynamic productThe kinetic product is the product that is formed most rapidlyFor a reaction in which the kinetic and thermodynamic products arenot the same the product that predominates depends on theconditions under which the reaction is carried out If the reactionis carried out under sufficiently mild lowtemperature conditionsto cause the reaction to be irreversible the major product will bethe kinetic product For example when addition    See Answer
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