Edexcel IAL Chemistry 5.4 Addition reactions of alkenes

Locate the carbon–carbon double bond, add one atom or group to each carbon, retain the carbon skeleton and apply the stated catalyst, reagent or aqueous condition.

Exam points

Give hydrogenation conditions using hydrogen and a nickel, platinum or palladium catalyst.
Draw halogen, hydrogen-halide, steam or manganate(VII) addition products.
Show alternative products when an unsymmetrical alkene reacts with an unsymmetrical reagent.

[Maximum number: 1]

This question is about alkenes.

Bisabolenes are a group of compounds found in plants and fungi. Bisabolene molecules contain several carbon-carbon double bonds.
5.51 g of $\alpha$ -bisabolene reacted with $1873 \mathrm{~cm}^{3}$ of hydrogen gas, $\mathrm{H}_{2}$ . The reaction occured at a temperature of $150^{\circ} \mathrm{C}$ and a pressure of 152000 Pa .
$\left[M_{\mathrm{r}}\right.$ value: $\quad \alpha$ -bisabolene $\left.=204.0\right]$

Deduce the number of carbon-carbon double bonds in a molecule of $\alpha$ -bisabolene, using your answers to (c)(i) and (c)(ii).

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5.4—The reactions of alkenes question 1