Find the odd one out:

  • Onions
  • Thioacetone
  • Naphthalene
  • Cyclobutadiene
  • Guanidine
  • Cadaverine
  • Carbon diselenide
  • Benzene

Edit: I forgot Benzene but I added it.


1 Answer 1


Is it



It is the only one without a pungent odor, and it is an antiaromatic hydrocarbon.


After searching Wikipedia, all of the other compounds(and onions), are found to have pungent odors.

  • 2
    $\begingroup$ Who else could solve this? (maybe riley) $\endgroup$
    – Duck
    Commented Aug 11, 2018 at 20:22
  • $\begingroup$ I meant to add benzene to the list but I forgot, but you more or less got it spot on you just need the word play. $\endgroup$
    – tox123
    Commented Aug 12, 2018 at 0:09
  • 1
    $\begingroup$ @QuantumTwinkie drop the prefix and you've got it. $\endgroup$
    – tox123
    Commented Aug 12, 2018 at 0:11
  • $\begingroup$ @QuantumTwinkie not really, think about what I added and think about synonyms (not at the same time) $\endgroup$
    – tox123
    Commented Aug 12, 2018 at 0:15
  • 1
    $\begingroup$ @QuantumTwinkie nope. Think about the tags. $\endgroup$
    – tox123
    Commented Aug 12, 2018 at 0:50

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