If a synthesis reaction is a reaction in which two or more substances react together to form just one product, then how is it that photosynthesis has two products; glucose and oxygen?

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    $\begingroup$ Where did you get that definition of synthesis? It is not one I recognise. There is always more than one product from a synthetic reaction. $\endgroup$
    – Waylander
    Mar 17 '20 at 13:11
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    $\begingroup$ Did you encounter the word «byproduct»? Its use is not limited to chemistry (en.wikipedia.org/wiki/By-product). $\endgroup$
    – Buttonwood
    Mar 17 '20 at 17:04
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    $\begingroup$ The school definition of synthesis is pretty much never used outside of school. $\endgroup$ Mar 17 '20 at 17:11
  • $\begingroup$ Photosynthesis is a most complex set of reactions, all of which occur in proteins and in the chloroplast cell membrane and have taken at least 50 years to sort out by numerous scientists. Look for 'primary processes' and 'light reactions' in photosynthesis and the Calvin cycle for the dark reactions. $\endgroup$
    – porphyrin
    Mar 17 '20 at 19:48

I think you're being a little too strict with your definition of what a synthesis reaction is. A better way to describe it might be building more complex molecules from simpler ones.

Wouldn't you say $\ce{C6H12O6}$ is more complex than $\ce{CO2}$ and $\ce{H2O}$?


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