Structure and formulae of alkenes

• what type of bond do all alkenes contain

  c=c
• what is the general formula for the homologous series of alkenes

  CnH2n
• why are alkenes unsaturated

  contain 2 fewer hydrogen atoms than the alkane with the same number of carbon atoms
• what are the first 4 members of the homologous series of alkenes

  ethene, propene, butene, pentene
• what alcohol will be produced when water reacts with butane

  butanol
• what chemical is produced when bromine reacts with pentene

  bromopentane