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I've made this mistake so I wanted to clarify for those looking--adding an ethyl group tends to change the chain. For instance hexane. Adding an ethyl group to the a 3-carbon chain just creates a 4-carbon chain with two methyl groups. It looks different at first glance, but you always want to make sure to recount the longest chain. That being said, for heptane there are nine structural isomers.
@@amitojsinghgrover2494idk about the name, but that chain isn't shown in the video and it should be possible as a functional isomer also it would be 3-ethylpentane because you always choose the longest chain and in this case it's 5