But-2-ene can be converted into butan-2-ol by reaction with steam. Identify a suitable catalyst and an appropriate temperature for this industrial hydration process.

Write a chemical equation for this hydration reaction.

In a laboratory, butan-2-ol can be dehydrated back to but-2-ene. What type of reaction is dehydration?

Write a chemical equation for the dehydration of butan-2-ol to form but-2-ene.

But-2-ene and but-2-yne can both be burned as fuels. The equations for their complete combustion are:

• But-2-ene: \

\text{C}_4\text{H}_6 + 5.5\text{O}_2 \rightarrow 4\text{CO}_2 + 3\text{H}_2\text{O}{\char"24}$ Under restricted oxygen supply, incomplete combustion is a significant risk. Suggest why but-2-ene is more susceptible to incomplete combustion than but-2-yne per mole of fuel burned.

Name the dangerous gas produced during incomplete combustion and explain why it is toxic to humans.