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Describe the following conversions: a) Fe2+ to Fe3+ b) I- to I2 c) C2H4 to C2H6 d) C2H5OH to C2H6

Chemistry

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Step-by-step solution

6 steps

Here's how each conversion is carried out:

Part a· 1 step

Fe(aq)2+⟶Fe(aq)3+\text{Fe}^{2+}_{\text{(aq)}} \longrightarrow \text{Fe}^{3+}_{\text{(aq)}}

This is an oxidation reaction.

  1. Add an oxidizing agent such as acidified potassium permanganate (KMnO4\text{KMnO}_4) or hydrogen peroxide (H2O2\text{H}_2\text{O}_2).

    Example reaction with hydrogen peroxide:

    2Fe2+(aq)+H2O2(aq)+2H+(aq)⟶2Fe3+(aq)+2H2O(l)2\text{Fe}^{2+}\text{(aq)} + \text{H}_2\text{O}_2\text{(aq)} + 2\text{H}^{+}\text{(aq)} \longrightarrow 2\text{Fe}^{3+}\text{(aq)} + 2\text{H}_2\text{O}\text{(l)}

Part b· 1 step

I(aq)−⟶I2(s)\text{I}^{-}_{\text{(aq)}} \longrightarrow \text{I}_{2\text{(s)}}

This is an oxidation reaction.

  1. Add an oxidizing agent such as chlorine water (Cl2(aq)\text{Cl}_2\text{(aq)}) or hydrogen peroxide (H2O2\text{H}_2\text{O}_2).

    Example reaction with chlorine water:

    2I−(aq)+Cl2(aq)⟶I2(s)+2Cl−(aq)2\text{I}^{-}\text{(aq)} + \text{Cl}_2\text{(aq)} \longrightarrow \text{I}_2\text{(s)} + 2\text{Cl}^{-}\text{(aq)}

Part c· 2 steps

C2H4⟶C2H6\text{C}_2\text{H}_4 \longrightarrow \text{C}_2\text{H}_6

This is a hydrogenation (addition) reaction.

  1. React ethene (C2H4\text{C}_2\text{H}_4) with hydrogen gas (H2\text{H}_2).

  2. Heat the mixture in the presence of a nickel catalyst (e.g., at 150-200°C).

    C2H4(g)+H2(g)→Ni catalyst, heatC2H6(g)\text{C}_2\text{H}_4\text{(g)} + \text{H}_2\text{(g)} \xrightarrow{\text{Ni catalyst, heat}} \text{C}_2\text{H}_6\text{(g)}

Part d· 2 steps

C2H5OH⟶C2H6\text{C}_2\text{H}_5\text{OH} \longrightarrow \text{C}_2\text{H}_6

This conversion involves two steps:

  1. Dehydration* of ethanol to ethene.

    • Heat ethanol (C2H5OH\text{C}_2\text{H}_5\text{OH}) with concentrated sulfuric acid (H2SO4\text{H}_2\text{SO}_4) at 170°C. C2H5OH(l)→conc. H2SO4,170∘CC2H4(g)+H2O(l)\text{C}_2\text{H}_5\text{OH}\text{(l)} \xrightarrow{\text{conc. H}_2\text{SO}_4, 170^\circ\text{C}} \text{C}_2\text{H}_4\text{(g)} + \text{H}_2\text{O}\text{(l)}
  2. Hydrogenation* of ethene to ethane.

    • React the ethene (C2H4\text{C}_2\text{H}_4) produced with hydrogen gas (H2\text{H}_2).
    • Heat the mixture in the presence of a nickel catalyst (e.g., at 150-200°C). C2H4(g)+H2(g)→Ni catalyst, heatC2H6(g)\text{C}_2\text{H}_4\text{(g)} + \text{H}_2\text{(g)} \xrightarrow{\text{Ni catalyst, heat}} \text{C}_2\text{H}_6\text{(g)}
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