IB Chemistry SL 3.2.11 Reduction of Unsaturated Compounds Questions

Use real SL exam questions to choose hydrogenation conditions and draw products formed when unsaturated oils gain hydrogen.

Exam points

State the conditions for catalytic hydrogenation of an alkene, alkyne or unsaturated oil, including hydrogen, heat or pressure and a finely divided metal catalyst.
Deduce the structural product when H₂ adds across one or more C=C or C≡C bonds, preserving the carbon skeleton and showing the resulting saturation.
Explain how hydrogenation lowers unsaturation and converts an oil or polyunsaturated fatty acid into a more saturated fat, including partial versus complete hydrogenation.

[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 SL 3.2.11 Reduction of Unsaturated Compounds Questions question 1 — IB Chemistry SL

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

State the conditions required for this reaction to occur.

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IB Chemistry SL 3.2.11 Reduction of Unsaturated Compounds Questions question 1