Consider each pair of compounds below and determine whether the pair represent the same compound, constitutional isomers, or different compounds that are not isomeric at all:
Alright guys, so we have a couple of different choices to pick from between looking at these two compounds, we can say yes they're the same compound, right? or we can say they're different compounds or we can say that they're connected differently, so we can say that they have the same formula but different connectivities of constitutional isomers, so let's look at our first pair, we have two different five membered rings, right? Where one of them have a bond here separating these two groups and the other one has a bond here and two groups up here, so what do you think? Well, if you pay attention, we have two methyl groups coming up there, right? On this carbon, let's call it carbon one. Now, look at this carbon one over here, it has one methyl group, the other methyl group actually moved over here, let's say our carbon number two, so what do you guys think? well, are they connected the same, right? Well, it doesn't look like they're connected the same because a methyl move the whole carbon away, this is definitely not going to represent resonance structures, okay? And let's see they're going to have actually the same molecular formula, both of these structures are going to have the formula C7H12, okay? If you cut all the carbon and hydrogens, so what that means is they have the same formula, right? Same molecular formula but we're going to say that they have different connectivity, so different connectivity, what does that mean we can call these two compounds, it means we can call them constitutional isomers to each other, okay? So, pay attention to what you see, two structures that different connectivity but have the same formula, right guys? So these two compounds once again our constitutional isomers to each other. Alright, so let me know if you have any questions and I hope that makes sense.