aromatics

Molecular formula for benzene

C6H6

What was kekules idea for benzene

Cyclic and planar with alternating single and double bonds

Reasons why kekules model is false

Substitution with halogens is not as expected

Hydrogenation enthalpies wrong (compound is less energetic than expected)

Bond lengths should be different for double and single bonds, but it is a perfect hexagon

Instead of adding with bromine water, what does benzene do

Substitutes where a hydrogen is swapped with a bromine

What is the delocalised model of benzene

Pi bonds from the overlap if p orbitals above and below the plane of bonded atoms are all connected to each other, so electrons become delocalised across the whole pi system (ring)

How does the delocalised model explain enthalpy issues with kekules model

The pi system makes the molecule more stable so less exothermic

Prefix for benzene

Phenyl

Name the molecules