Chemistry 0620 · IGCSE · Alkanes

Alkanes — practice question

Cyclopropane is a colourless gas, and it reacts with bromine at room temperature, as shown by the equation below. cyclopropane + bromine → dibromopropane
(a(i))[1]

State the empirical formula of cyclopropane.

(a(ii))[2]

What colour change, if any, would you observe when cyclopropane is bubbled into aqueous bromine? Give the initial colour and the final colour.

(b(i))[2]

Complete the energy level diagram for this reaction by adding the product and labelling the energy change, $\Delta H$.

(b(ii))[3]

From the bond energies in the table, calculate the energy change, $\Delta H$, for the reaction.

(c)[2]

Explain why iodine has a higher boiling point than bromine.

Worked solution & mark scheme

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