level: Level 1 of Aromatics
Questions and Answers List
level questions: Level 1 of Aromatics
| Question | Answer |
|---|---|
| Kekule model | carbon ring with single and double bonds |
| What is the evidence to disprove Kekule's model | 1. lack of reactivity -if Benzene contained double bonds they should decolourise bromine in electrophillic addition 2. The length of the carbon-carbon bonds in benzene -it would be possible to measure the bond length 3.Hydrogenation enthalpies - |
| What is the delocalised model of Benzene | Benzene is planar adjacent p orbitals sideways overlapping of p orbitals to form sigma bonds |
| Nitration of benzene addition of HNO3 (5O DEGREES) | benzne + HNO3 = NO2 attached + H20 |
| Benzene with HN02 at 70 degrees | Benzene + 2HNO3 = 2 NO2 attached to benzense + 2 water |
| Bromination of benzene | electrophillic substitution |
| Chlorination of benzene | Benzene + Cl2 =(AGcl2) benzene with Cl added forming HCL |
| Acyl chlorides with benzene | benzene + acylchloride = Alcl3 = Benzene with it attached + HCl |
| Is phenol a weak acid | yes due it is soluble in water due to non polar benzene ring |
| What bromine water is added to phenol | bromine decolourises and white precipitate formed |
| What directing groups does NH2 go to | 2 and 4 |
| What directing groups does N02 go to | 3 and 5 |
| Which directing groups do OH /halogens go to | 2 and 4 |
| what groups are 1 and 3 directing | -COOH -CN N02 |