Complete each hydrogenation reaction. c.

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Identify the reactant in the hydrogenation reaction. Typically, this will be an unsaturated hydrocarbon, such as an alkene or alkyne, which contains double or triple bonds.

Determine the type of hydrogenation reaction. In this case, it is likely a catalytic hydrogenation, where hydrogen gas (H_2) is added across the double or triple bonds in the presence of a catalyst, such as palladium (Pd), platinum (Pt), or nickel (Ni).

Write the balanced chemical equation for the hydrogenation reaction. For example, if the reactant is an alkene (C=C), the reaction would be: C=C + H_2 → C-C, where the double bond is converted to a single bond.

Consider the stereochemistry of the reaction. In catalytic hydrogenation, the addition of hydrogen is typically syn, meaning both hydrogen atoms add to the same side of the double bond, resulting in a cis product if applicable.

Verify the product structure. Ensure that all double or triple bonds in the reactant have been converted to single bonds in the product, and that the molecular formula is consistent with the addition of hydrogen.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Hydrogenation

Hydrogenation is a chemical reaction that involves the addition of hydrogen (H2) to an unsaturated compound, typically an alkene or alkyne, converting it into a saturated compound. This process is commonly used in organic chemistry to reduce double or triple bonds, resulting in alkanes. Catalysts, such as palladium, platinum, or nickel, are often employed to facilitate the reaction and increase its efficiency.

Reaction Mechanism

The reaction mechanism describes the step-by-step sequence of elementary reactions by which a chemical change occurs. Understanding the mechanism of hydrogenation is crucial, as it involves the formation of a transition state and the breaking and forming of bonds. This knowledge helps predict the products of the reaction and the conditions required for it to proceed effectively.

Saturation and Unsaturation

In organic chemistry, saturation refers to the presence of single bonds between carbon atoms in a molecule, while unsaturation indicates the presence of double or triple bonds. Saturated compounds, such as alkanes, are generally more stable and less reactive than unsaturated compounds, like alkenes and alkynes. Recognizing the degree of saturation is essential for predicting the outcomes of hydrogenation reactions.