Understand Ethene its structure and properties. Click on the link to Watch the VIDEO explanation:
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Ethene is the first member of the homologues series of alkenes. It occurs in nature along natural gas. Observe the Lewis dot structure representing the electronic structure in ethene. The HCH bond angle in ethene is 120°. Ethene may be manufactured on a large scale by thermal cracking of larger alkanes like kerosene C14H30. Shown here is the laboratory method used for demonstration of cracking. Sand soaked in kerosene and broken china are heated alternatively. The vapour of kerosene get absorbed in the pours of broken china. The kerosene vapour decompose or crack to liberate ethene gas. Ethene being sparingly soluble in water is collected by downward displacement of water. Laboratory method of preparation of ethene. Ethene is prepared in laboratory by the dehydrating action of conc H2SO4 and ethyl alcohol. Ethyl alcohol is dropped on a mixture of sand and aluminium sulphate. A few drops of conc H2SO4 are then dropped into the flaskthrough the thistle funnel. The flask is heated gently to about 170°C. Ethene gas evolved is collected by the downward displacement of water. Ethene is highly combustible. It burns in air with a luminous sooty flame producing CO2 and water vapour. Bromination. Test for saturation. The orange colour of bromine solution gets colourless in ethene. Ethene polymerises to form polythene or poly ethylene. Several molecules of ethene at high temperature and pressure combines in presence of traces of oxygen to form the polymer chain of polythene. Ethene decolourises the purple pink colour of Bayer's reagent.
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Ethene is the first member of the homologues series of alkenes. It occurs in nature along natural gas. Observe the Lewis dot structure representing the electronic structure in ethene. The HCH bond angle in ethene is 120°. Ethene may be manufactured on a large scale by thermal cracking of larger alkanes like kerosene C14H30. Shown here is the laboratory method used for demonstration of cracking. Sand soaked in kerosene and broken china are heated alternatively. The vapour of kerosene get absorbed in the pours of broken china. The kerosene vapour decompose or crack to liberate ethene gas. Ethene being sparingly soluble in water is collected by downward displacement of water. Laboratory method of preparation of ethene. Ethene is prepared in laboratory by the dehydrating action of conc H2SO4 and ethyl alcohol. Ethyl alcohol is dropped on a mixture of sand and aluminium sulphate. A few drops of conc H2SO4 are then dropped into the flaskthrough the thistle funnel. The flask is heated gently to about 170°C. Ethene gas evolved is collected by the downward displacement of water. Ethene is highly combustible. It burns in air with a luminous sooty flame producing CO2 and water vapour. Bromination. Test for saturation. The orange colour of bromine solution gets colourless in ethene. Ethene polymerises to form polythene or poly ethylene. Several molecules of ethene at high temperature and pressure combines in presence of traces of oxygen to form the polymer chain of polythene. Ethene decolourises the purple pink colour of Bayer's reagent.
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