Mechanism of the <a href="https://en.wikipedia.org/wiki/nucleophilic_addition" class="extiw" title="w:nucleophilic addition">nucleophilic addition</a> of a water molecule to an <a href="https://en.wikipedia.org/wiki/Aldehyde" class="extiw" title="w:Aldehyde">Aldehyde</a> group
<a href="//commons.wikimedia.org/wiki/User:Sponk" title="User:Sponk">Sponk</a>
<span class="int-own-work" lang="en">Own work</span>