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it simply means presence of a double bond

more clearly:An unsaturated hydrocarbon has fewer than the maximum possible number of hydrocarbons, due to the presence of carbon-carbon double bonds at some point in the chain. (Since a carbon can only have 4 bonds total, a double bond uses 2 instead of 1, reducing the bonds available to hold hydrogen atoms.) Unsaturated hydrocarbons can have only one double bond (mono-unsaturated) or can have many

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14y ago

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