alkenes
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why are alkenes also called olefins
alkenes are also called olefins because the lower members of alkenes form oily products when treated with chlorine and bromine
what is alkenes general formula
CnH2n where n = number of carbon atoms
how are alkenes collected and why
downward displacement of water because • –> insoluble in water • —> inflammable gas
what are 3 physical properties of ethene
• –> colourless gas having a faint sweet smell • –> sparingly soluble in water and soluble in organic solvents • –> vapour density is 14 • —> lighter than air
3 uses of ethene
• -> used in artificial ripening of fruits • –> used in the manufacture of ethyl alcohol • –> used in the preparation of polythene
which decolorize bromine solution in carbon tetrachloride
ethene
____ and _____ are prepared by cracking petroleum
ethylene and propylene
what is Markownikoff’s rule
during the addition of halogen acids to unsymmetrical alkenes, the negative part of the reagent goes to the carbon atom with a lesser number of the hydrogen atom positive part to other carbon atoms
a hydrocarbon which on catalytic hydrogenation gives a saturated hydrocarbon
ethene
give a chemical test to distinguish between ethane and ethene gas
ethene gas decolourizes the purple color of the alkaline potassium permanganate solution while ethane gas does not
what type of reaction does ethene undergo
addition reaction as it is an unsaturated hydrocarbon
the melting point of alkenes increases with ____________ in molecular weight
INCREASE
which gas is used in making household plastic material
ethylene / ethene
gas used in ripening fruits
ethylene / ethene