A museum educator is sorting four molecular-model cards. Each card shows the displayed formula of a molecule.
| Sample | Displayed formula |
|---|---|
| A | H∣H−C−H∣H\begin{array}{ccccc} & \text{H} & & & \\ & \vert{} & & & \\ \text{H}- & \text{C} & - & \text{H} & \\ & \vert{} & & & \\ & \text{H} & & & \end{array}H−H∣C∣H−H |
| B | HH∣∣H−C=C−H\begin{array}{ccccc} & \text{H} & & \text{H} & \\ & \vert{} & & \vert{} & \\ \text{H}- & \text{C} & = & \text{C} & -\text{H} \end{array}H−H∣C=H∣C−H |
| C | HH∣∣H−C−C−H∣∣HH\begin{array}{ccccc} & \text{H} & & \text{H} & \\ & \vert{} & & \vert{} & \\ \text{H}- & \text{C} & - & \text{C} & -\text{H} \\ & \vert{} & & \vert{} & \\ & \text{H} & & \text{H} & \end{array}H−H∣C∣H−H∣C∣H−H |
| D | HHH∣∣∣H−C−C−C−H∣∣∣HHH\begin{array}{ccccccc} & \text{H} & & \text{H} & & \text{H} & \\ & \vert{} & & \vert{} & & \vert{} & \\ \text{H}- & \text{C} & - & \text{C} & - & \text{C} & -\text{H} \\ & \vert{} & & \vert{} & & \vert{} & \\ & \text{H} & & \text{H} & & \text{H} & \end{array}H−H∣C∣H−H∣C∣H−H∣C∣H−H |
Which sample contains the alkene functional group?
Sample B
Sample A
Sample D
Sample C
97 exam-style questions on AQA GCSE Chemistry 7.2 Reactions of alkenes and alcohols, covering 7.2.1 Structure and formulae of alkenes, 7.2.2 Reactions of alkenes, 7.2.3 Alcohols, 7.2.4a Carboxylic acids, and 7.2.4b Carboxylic acids as weak acids. Each one has a worked solution and a mark scheme showing where the marks go.