Question

how does an onion smell​

Answer 1

Onions and garlic are members of the allium family. They're similar in composition and contain many of the same sulfur compounds. Sulfur compounds give foods their distinctive flavor. They also release distinctive gasses when cut or mashed and mingle with gas-emitting bacteria, causing scented breath.

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Answer 2

The presence of a chemical component called amino acid sulfoxides gives the vegetables of the allium genus their distinct odour and flavour.

Explanation:

• The main component present, allyl methyl sulphide, is also responsible for eye watering and poor breath.
• Peeling and cutting onions releases enzymes called allinases, which convert the sulfoxides in onions to sulfenic acids.
• The scent is produced by the condensation of these acids. The sulfur-containing compounds are responsible for the distinctive odour.
• When the cell walls of onions are destroyed during chopping, peeling, or cutting, an enzyme is released, which creates these chemicals. Because these compounds are irritants, it also serves as a defence mechanism.