Complete each hydrogenation reaction. b.

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Identify the reactant involved in the hydrogenation reaction. Typically, this will be an unsaturated hydrocarbon such as an alkene or alkyne.

Understand that hydrogenation involves the addition of hydrogen (H₂) across the double or triple bonds of the unsaturated hydrocarbon, converting it into a saturated hydrocarbon.

Write the balanced chemical equation for the reaction. For example, if the reactant is an alkene, the general reaction is: \[ \text{R-CH=CH-R'} + \text{H}_2 \rightarrow \text{R-CH}_2\text{-CH}_2\text{-R'} \]

Determine the conditions required for the reaction to proceed, such as the presence of a catalyst (commonly palladium, platinum, or nickel) and appropriate temperature and pressure.

Predict the product of the hydrogenation reaction, which will be a saturated hydrocarbon, and ensure that the equation is balanced in terms of both atoms and charge.

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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.

Reaction Mechanism

The reaction mechanism describes the step-by-step sequence of elementary reactions by which overall chemical change occurs. Understanding the mechanism of hydrogenation is crucial, as it involves the formation of intermediates and the role of catalysts. This knowledge helps predict the products and the conditions required for the reaction to proceed efficiently.

Saturation and Unsaturation

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