Chemistry 0620 · IGCSE · Alkenes

Alkenes — practice question

The structures of five alkenes, A, B, C, D and E, are displayed.
(a)[1]

What is the general formula for alkenes?

(b)[1]

What is the molecular formula for alkene D?

(c)[2]

Which alkene, A, B, C, D or E, do you predict has the highest boiling point? Explain your answer.

(d)[2]

Which alkene, A, B, C, D or E, diffuses the fastest? Explain your answer.

(e)[2]

A student added aqueous bromine to alkene C. Describe the colour change observed and draw the structure of the product. Show all of the atoms and all of the bonds.

(f(i))[2]

Draw the structures of the two alcohols made from alkene B by an addition reaction. Show all of the atoms and all of the bonds.

(f(ii))[3]

State the reagent and conditions required to make an alcohol from alkene B.

(g(i))[1]

What type of polymerisation takes place?

(g(ii))[1]

Suggest the name of the polymer formed.

(g(iii))[3]

Complete the chemical equation to represent this polymerisation.

(g(iv))[1]

State the empirical formula of the polymer formed.

Worked solution & mark scheme

This 19-mark question has a full step-by-step worked solution and mark scheme. One marking point: CₙH₂ₙ

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