Chemistry 5070 · O Level · Alkenes

Alkenes — practice question

Alkenes form a homologous series of unsaturated hydrocarbons. The table gives information about some alkenes.
(a)[2]

Decene is liquid at $25\,^{\circ}\text{C}$. How do you deduce this from the table data?

(b)[2]

Butene has a boiling point of $-6\,^{\circ}\text{C}$. Use the kinetic particle theory to explain what occurs as butene boils.

(c)[2]

A sample of ethene gas in a gas syringe is heated from $20\,^{\circ}\text{C}$ to $100\,^{\circ}\text{C}$. The pressure stays constant. Describe and explain, in terms of the kinetic particle theory, what happens to the gas volume.

(d)[1]

At room temperature, ethene diffuses more quickly than butene. Explain why.

(e)[2]

Draw the structure, showing all the atoms and all the bonds, of two isomers that have the molecular formula $\text{C}_4\text{H}_8$.

(f)[1]

The structure of hexene is shown. Draw the structure, showing all the atoms and all the bonds, of the product formed when hexene reacts with steam.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: Melting point is below $25\,^{\circ}\text{C}$

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