Hydrogenation problems focus on interpreting reaction mechanisms where alkenes or alkynes are converted to alkanes through the addition of hydrogen (H₂) in the presence of a catalyst. Key skills include identifying the type of unsaturation, predicting stereochemical outcomes, and distinguishing between partial and complete hydrogenation. Understanding catalyst roles and reaction conditions is essential for analyzing reaction pathways and product distributions.

Practice questions often require you to classify substrates, explain regioselectivity and stereoselectivity, and apply concepts of syn addition. Common tasks include comparing hydrogenation with other addition reactions, interpreting reaction intermediates, and reasoning about the impact of catalyst choice on reaction rate and selectivity.

Catalytic Hydrogenation and Wilkinson's Catalyst: Videos & Practice Problems