A chemical bond in which two pairs of electrons are shared between two atoms.
- This is in contrast with most electrophilic additions to carboncarbon double bonds, and with nucleophilic substitutions at saturated carbon atoms.
- The benzene molecule is a six-carbon ring with alternating single and double bonds between the carbon atoms.
- Organic sulfates are esters and are formed by reacting an alcohol with cold sulfuric acid or by the reaction of sulfuric acid with a double bond in an alkene.
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