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The characteristic smell of onion bulbs is due to:1. Bad odour of soil, where grown2. Sulphur compounds3. Sugar4. Reserve carbohydrates

Answer» Correct Answer - Option 2 : Sulphur compounds

The correct answer is Sulphur compounds.

  • The characteristic smell of onion is due to the emission of Sulphur and its derivatives from it.
  • Onion belongs to the genus Allium.
  • The chemicals that give characteristic flavours to Allium vegetables are a class of compounds called amino acid sulfoxides.
  • The chemical in Onion that gives bad breath from the mouth is allyl methyl sulfide.
  • The peeling and cutting of onion release enzymes called allinases which convert these sulfoxides into sulfenic acids.
  • These acids condense to give a pungent odour. 


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