# How is this Cope Reaction forming Ethene as major product?

I have been asked to find the major product of the reaction:

As this a case of pyrolysis of $$3^{\circ}$$ Amine Oxide (or, in other words, Cope Reaction), I figured there are two possible products hexene and hex-2-ene. Therefore, hex-2-ene should be the major product as it is the more substituted alkene.

But the solution to the question states that the major product is Ethene ($$\ce{H_2C=CH_2}$$). I have no idea how that is even possible.

Here is how I came to the conclusion that hex-2-ene will be the major product (which is basically the standard Cope reaction mechanism): Please provide clarification on this.

• This looks like an error. You can get propene (probably the major product) and the two hexenes you mentioned, but I can see no way of getting ethene. – Waylander Apr 18 at 9:10
• @Waylander This must be an error then. Errors are not rare in organic chemistry question banks, or at least, that is the case with my book. – SmartRadical Apr 18 at 10:05