Carbon Compounds - Alkene (Structured)

Diagram 5 shows the flow chart of a series of reactions undergo by butene

(a) The molecular formula of butene is C₄H₈. State the meaning of molecular formula ? [1 mark]

(b) Butene is burnt completely in air to produce substance S and carbon dioxide gas. [1 mark]

(i) Complete the chemical equation below for the combustion reaction. [1 mark]

C₄H₈ + ....... O₂ --> 4CO₂ + ................

(ii) How many moles of substance S will be produced if 0.2 mol of butene is used in the reaction? [1 mark]

(c) Butene undergo hydration reaction to form substance P.

(i) Draw the structural formula of substance P[1 mark]

(ii) Substance P can undergo dehydration to form butene again.  Draw a labeled apparatus set- up for this dehydration reaction.[2 mark]

(d) (i) Name another chemical substance that can be used to replace acidified potassium manganate(VII) solution in Process I . [1 mark]

(ii) State one physical property of substance Q. [1 mark]

(e) Based on Process II,

(i) name substance R. [1 mark]

(ii) what would be observed when substance R is added to water? [1 mark]
[Kedah, Paper 2, 2011]

Answer: