IB Chemistry HL 3.2.11 Reduction of Unsaturated Compounds Questions

Use real HL exam questions to classify hydrogenation as reduction, deduce alkene/alkyne products and select catalyst conditions.

Exam points

Predict the saturated product from the displayed unsaturated structure, including complete hydrogenation of alkenes and alkynes.
State suitable hydrogenation conditions, including hydrogen, heat or pressure and a finely divided metal catalyst.
Classify hydrogenation as reduction and addition across a multiple bond, and relate partial or complete hydrogenation to the resulting saturation.

[Maximum number: 1]

Alkenes, such as A (shown below), are important intermediates in the petrochemical industry because they undergo addition reactions to produce a wide variety of products, such as the conversion shown below.

Figure for Question IB Chemistry HL 3.2.11 Reduction of Unsaturated Compounds Questions question 1 — IB Chemistry HL

In the gas phase, A reacts with hydrogen to form D :

State the conditions required for this reaction to occur.

$\quad \mathrm{Ni} / \mathrm{Pt} / \mathrm{Pd}$ catalyst;

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IB Chemistry HL 3.2.11 Reduction of Unsaturated Compounds Questions question 1