1
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Find the odd one out:

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

Edit: I forgot Benzene but I added it.

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1
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Is it

cyclobutadiene

because

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

And

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

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  • 2
    $\begingroup$ Who else could solve this? (maybe riley) $\endgroup$ – Duck Aug 11 '18 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 Aug 12 '18 at 0:09
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    $\begingroup$ @QuantumTwinkie drop the prefix and you've got it. $\endgroup$ – tox123 Aug 12 '18 at 0:11
  • $\begingroup$ @QuantumTwinkie not really, think about what I added and think about synonyms (not at the same time) $\endgroup$ – tox123 Aug 12 '18 at 0:15
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    $\begingroup$ @QuantumTwinkie nope. Think about the tags. $\endgroup$ – tox123 Aug 12 '18 at 0:50

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