Benzene And Phenols (F324)

Front 1

List 3 problems of Kekule's model for benzene

Back 1

It would be too reactive, would undergo addition reactions and has a too high enthalpy of hydrogenation

Front 2

How does bonding work in Kekule's model of Benzene?

Back 2

Three double bonds would move constantly

Front 3

Why is benzene unreactive?

Back 3

Due to the delocalised electron system

Front 4

What type of reaction does benzene usually undergo?

Back 4

Electophilic Substitution

Front 5

Describe the length of c-c bonds in benzene

Back 5

In-between the length of a single and double c-c bond

Front 6

Why does benzene have a low enthalpy of hydrogenation?

Back 6

Due to delocalisation stabilisation

Front 7

Conditions for benzene reaction

Back 7

Halogen carrier and 50°C

Front 8

Explain the relative resistance to bromination of Benzene compared with alkenes (4) LIST POINTS 1-4

Back 8

1) In benzene, electrons are delocalised

2) In alkenes, pi electrons are localised

3) Benzene has a lower electron density

4) Benzene polarises bromine less

Front 9

Why does benzene undergo substitution reactions?

Back 9

This keeps the low energy delocalised electron system intact

Front 10

Why is phenol more reactive than benzene? (3)

Back 10

The lone pair of electrons from oxygen are drawn into the benzene ring, increasing the ring's electron density, the ring is activated

Front 11

Which areas of phenol allow bonding, and Why?

Back 11

Positions 2, 4 and 6, due to their high electron density

Front 12

What reagent reacts with both a carboxylic acid and an alcohol, formula and name?

Back 12

NaOH, Sodium hydroxide