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- Solutions 8

By applying Hammond’s postulate to the potential energy diagram for this reaction, we can say that:

A. the structure of 2 is more carbocation-like than 4

B. the structure of 2 is less carbocation-like than 4

C. the structure of 2 resembles 1 more than it resembles 3

D. the structure of 4 resembles 5 more than it resembles 3

Hey guys. So, here is our energy diagram and it's going to correspond with our question and it wants to know with our Hammond postulate and Johnny has some great videos explaining this, we can say that which one of our state's of our graph are going to resemble another. So, for example, a talks about 2, and it says, looking at 2, it's already circled for us, it wants to know is it more like for more carbocation like or is it less carbocation like than 4, okay? So let's take a look ,we're looking at either 2 or 4 and if you look at just this part, it wants to know which ones more carbocation like, well just so you know if we scroll up we can take a look at our reaction, our intermediate is actually highlighted it's that carbocation and we know that our intermediate is going to be at this position right here, 3 is going to be where our intermediate is in between those two peaks at the top, so if that's our intermediate, let's take a look at now the energy states, you think it's going to be like this energy state right here that's only this distance or you think it's going to be like more resemble the one that's a lot higher, when our Hammond's posture we talk about how it's going to resemble the one with the intermediate or the transition state here that's the most closely resembled, so what that means is just that if we see this little space here, in between 3 and 4 and if we look at the space between 3 and 2 the one that has the less space is the one between 3 and 4, okay? So that means that it looks like 4 is going to be more carbocation like than 2 and if we look at C, it says, 2 resembles one more than 3. So, do you think 2 all the way up here, let's erase all this, do you think 2 is going to resemble 1 or 3, looking at the rules? Well, there's either this, space, or all of this. So, 2 is actually going to resemble 3 more, so we can cross out C, which one can we pick for A and B? Well, we pick that 2 is going to be less than 4 and then the same thing applies for 4, let's erase this, let's now move to 4, is 4 going to resemble 3 more or 5? Well, 3, right? We just talked about that. So, D actually says the opposite, it says that 4 resemble 5 more, so we can cross it out, so we're just looking at the energy levels and the difference between them, we want them to be very close in energy in order to be more closely related. Alright guys, so if any of this you have any questions on it you can go ahead and watch your videos on Hammonds postulate and then come back and let's do this question again, okay? So hopefully it makes sense and let me know if you have any questions.