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<a accesskey="3" href="page.php?w=Spin-forbidden_reactions&amp;p=2">3.Next</a>
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<p>In <a href="page.php?w=chemistry">chemistry</a>, reactions that involve a change in spin state are known as <b>spin-forbidden reactions</b>. Such reactions show increased <a href="page.php?w=activation_energy">activation energy</a> when compared to a similar reaction in which the spin states of the reactant and product are isomorphic. As a result of this increased activation energy, a decreased <a href="page.php?w=reaction_rate">rate of reaction</a> is observed.  A famous example of spin-forbidden reaction is the very slow reaction of <a href="page.php?w=Allotropes_of_oxygen">{{chem</a></p><p>
<a accesskey="3" href="page.php?w=Spin-forbidden_reactions&amp;p=2">3.Next</a>
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