Chemistry 9701 · AS & A Level · Hydrocarbons

Hydrocarbons — practice question

Propene, $\text{C}_3\text{H}_6$, undergoes reaction with $\text{H}_2\text{O}$ in the presence of an acid catalyst to produce an alcohol whose molecular formula is $\text{C}_3\text{H}_8\text{O$.
(a)[1]

Name the reaction type shown.

(b)[2]

Name the catalyst used and state the conditions required for this reaction to happen.

(c)[2]

Fill in the table to indicate how many sigma ($\sigma$) bonds and pi ($\pi$) bonds are in propene, $\text{C}_3\text{H}_6$, and $\text{C}_3\text{H}_8\text{O}$.

(d(i))[3]

The reaction of propene, $\text{C}_3\text{H}_6$, with $\text{H}_2\text{O}$ takes place by a two-step mechanism. In step 1, $\text{C}_3\text{H}_6$ reacts with the catalyst, $\text{H}^+$, to produce a carbocation. Draw structures to show the more stable and less stable carbocations that can form in step 1. Explain your answer.

(d(ii))[1]

Name the principal organic product formed from the reaction of propene, $\text{C}_3\text{H}_6$, with $\text{H}_2\text{O}$.

(e(i))[1]

Under suitable conditions, 2-bromopropane is converted into propene, hydrogen bromide and water. Name this type of reaction.

(e(ii))[2]

State the reagents and conditions that favour this reaction. reagents … conditions …

Worked solution & mark scheme

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