Naming a more complex example is:The position number and the name of the alkyl group are placed in front of
the double-bond position number. The alkyl group above is an ethyl group. It is on
the second carbon atom of the parent hydrocarbon.
The name is: 2-ethyl-1-pentyne
Aromatics
The aromatic compounds are unsaturated ring structures. The basic formula of this
series is CnH 2 n-6, and the simplest compound is benzene (C 6 H 6 ). The benzene
structure is a resonance structure that is represented like this:
Note: The carbon-to-carbon bonds are neither single nor double bonds but hybrid
bonds. This structural representation is called resonance structures.
The benzene resonance structure can also be shown like this:TIP
C 6 H 6 , benzene is the simplest aromatic compound.The orbital structure can be represented like this: