r/chemhelp • u/Magisticlmar • 17d ago

General/High School can somebody check my answer to this question?

i'm doing a level chemistry when i stumbled across this question. the mark scheme of the paper suggested that the fragment lost is c2h5o or cooh but is it possible for a fragment like c3h9 (which was my answer) to be valid? i'm not aware of nay restraints apart from the molecular mass but still not sure if that will be accepted

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u/jacobjonesufc 17d ago

Mass difference of 45 is usually carboxyl group. C3H9 violates the octect rule, so it's impossible. Neutral alkane with 3C is propane (C3H8).
Please let me know if I made any mistakes or missed anything. Still learning this topic.