Chemistry 9701 · AS & A Level · Hydrocarbons

Hydrocarbons — practice question

Ethene can be made in a school or college laboratory from ethanol by using the apparatus shown below.
(a(i))[1]

State a balanced equation for this reaction.

(a(ii))[1]

What kind of reaction is this?

(a(iii))[1]

Give the chemical name of a reagent other than pumice that could be used to carry out this reaction. You do not have to use the same apparatus.

(b)[4]

Ethene is passed into two different test-tubes, one holding aqueous hydrogen bromide and the other containing cold, dilute acidified potassium manganate(VII). For each one, describe any colour change that would be seen and give the structural formula of the organic product.

(c(i))[1]

What is the molecular formula for cyclohexene?

(c(ii))[1]

Draw the structural formula of the compound made when cyclohexene reacts with bromine.

(c(iii))[1]

State as completely as you can the type of reaction this is.

(c(iv))[2]

Draw the structural formula of the compound formed when cyclohexene reacts with hot concentrated acidified potassium manganate(VII).

Worked solution & mark scheme

This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: Balanced equation: $\\mathrm{C_2H_5OH \\to C_2H_4 + H_2O}$

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