Question

How can you prepare propene from propyl alcohol?

Answer 1

Answer. Propene is prepared by heating a mixture of propyl alcohol and excess of concentrated sulphuric acid at 180°C. In first step, propyl hydrogen sulphate is formed which on heating .produces propene, which is collected over water.
                            180 °C
CH3-CH2-CH2OH + H2SO4 ———> CH3- CH2- CH2-OSO3H + H2O

                        heat
CH3-CH2-CH2OSO3H ———> CH3-HC= CH2 + H2SO4

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