I recently had my an initial orgo exam and also one that the concepts that I have actually trouble visceralizing is Hammond’s Postulate. I have the right to follow the explanation in mine textbook (L.G. Wade, Jr. 7th edition), yet I don’t really grasp it. Is there an alternate intuitive explanation?

The main explanation the Hammond’s Postulate is below, however here’s mine one-sentence quick intuitive explanation of Hammond’s postulate: as soon as drawing change state diagrams, put the “hump” (i.e. The shift state) closest come the varieties highest in energy. 

You probably already do this, yet it’s worth illustration out the “wrong” sort of change state diagram to make it much more clear. Let’s look in ~ an exergonic reaction. In an exothermic exergonic reaction, the reactants are highest in energy. Therefore the transition state have to be attracted closer come the reactant side. See how it doesn’t rather look ideal in the illustration on the left?

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One last question is what “the reaction coordinate” means. It’s expected to convey the progress of a reaction. In straightforward examples, the “reaction coordinate” deserve to refer to a shortcut length, although together multiple molecular reality can get involved, the applications is quite abstract. Think that it together “reaction progress”.

You are watching: The hammond postulate states that reactions which are thermodynamically endothermic and kinetically

I hope this answers your question, Diana!

In the comments, Richard points the end that ns should have actually written “exergonic” no “exothermic”.

Exergonic reaction: energy is exit to the surroundings. The binding being formed are stronger than the bonds being broken. An exothermic reaction is one where the energy released to the next site is warmth energy.

Most exergonic reactions are exothermic, but not all.

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For instance in the chemiluminescent failure of firefly luciferin, energy is exit to the surroundings as light. Check out here.