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Are the following two compounds isomers or not? I feel they are enantiomers(non-superimposable mirror images) however my book states that they are not isomers? I cannot understand why?

enter image description here

enter image description here

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    $\begingroup$ Probably a typo. You are correct that they are enantiomers. $\endgroup$ – Dan Burden Aug 23 '16 at 0:28
  • $\begingroup$ This is an example of a compound with no chiral center, but it is chiral. Compare 1,1-diethyl 3-methyl propa-1,2-diene (did I get the substituents in the right order?). $\endgroup$ – Oscar Lanzi Aug 23 '16 at 1:19
  • $\begingroup$ chemistry.stackexchange.com/q/42999/16683 #3 $\endgroup$ – orthocresol Aug 23 '16 at 4:47
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You are right, these two molecules are enantiomers. If you rotate the bottom molecule 180 degrees, you can see that it is the mirror image of the top molecule. Enantiomers are stereoisomers, so the only reason your book would say they are not isomers is that it (unfortunately) contains a typo.

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  • $\begingroup$ Or possibly they missed the concept that a molecule can have not a (single atom) chiral center and yet be chiral. $\endgroup$ – Oscar Lanzi Aug 23 '16 at 22:48

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