Multiple Bonds
Two atoms can be bonded by sharing more than one pair of electrons. The common bonds to carbon are single, double and triple bonds. Single bonds are most common and are represented by a single, solid line between two atoms in a skeletal formula. Double bonds are denoted by two parallel lines, and triple bonds are shown by three parallel lines.
In more advanced theories of bonding, non-integer values of bond order exist. In these cases, a combination of solid and dashed lines indicate the integer and non-integer parts of the bond order, respectively.
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Hex-3-ene has an internal carbon-carbon double bond -
Hex-1-ene has a terminal double bond -
Hex-3-yne has an internal carbon-carbon triple bond -
Hex-1-yne has a terminal carbon-carbon triple bond
Read more about this topic: Skeletal Formula
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