Problems and exercisesDehydrogenation

1. Complete the reactions

Write the organic product of the dehydrogenation of:

1. Ethane (loses one molecule of H₂)
2. Cyclohexane (loses three molecules of H₂)
3. Cyclooctane (loses one molecule of H₂)

2. Oxidation or reduction?

Classify each transformation as an oxidation or a reduction:

1. Propane → propene
2. Ethene → ethane
3. Cyclohexane → benzene

3. The hydrogen acceptor

In the iridium catalytic cycle, tert-butylethene is 'sacrificed'. What does it become, and what is it for?

4. Energy

Is the dehydrogenation of an alkane exothermic or endothermic? Why does it need high temperatures and catalysts?