Is the organic reactant oxidized, reduced, or neither in...

Is the organic reactant oxidized, reduced, or neither in each of the following reactions?
(a) 2 -hexene ${ }_{\text {cold } \mathrm{OH}^{-}}^{\mathrm{KMnO}_{4}} 2,3$ -dihydroxyhexane
(b) cyclohexane $\frac{\Delta}{\text { cataly }_{\text {st }}}$ benzene $+3 \mathrm{H}_{2}$

Key Concepts

Dehydrogenation Reactions

Dehydrogenation is a specific type of oxidation reaction in organic chemistry where hydrogen atoms are removed from a molecule, often resulting in the formation of an unsaturated compound. It is an important concept for understanding how a molecule’s structure and degree of saturation can vary through catalytic or thermal processes.

Redox Reactions in Organic Chemistry

Redox reactions involve the simultaneous occurrence of oxidation and reduction processes. In organic chemistry, these reactions can be subtle since bond changes do not always correspond to noticeable oxidation state changes. Recognizing whether a reaction is redox in nature requires careful examination of the changes in the bonding environment around key atoms.

Reduction

Reduction in organic reactions refers to the decrease in the oxidation state of a substance, typically through the removal of electronegative atoms or the addition of hydrogen atoms. This concept is key in understanding how molecules gain electrons or hydrogen during reactions.

Oxidation

Oxidation in organic chemistry generally involves an increase in the oxidation state of a molecule, often through the addition of electronegative atoms (such as oxygen) or the removal of hydrogen atoms. The concept is central to many organic transformations and helps determine how molecules change during chemical reactions.

Oxidation States in Organic Molecules

Understanding oxidation states is crucial in organic chemistry because it allows chemists to track the formal changes in electron density on carbon atoms as a result of chemical transformations. Although the actual electron distribution in covalent bonds is complex, assigning oxidation states is a useful bookkeeping tool for classifying redox processes.

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