Flashcards
Benzene
Cards in this deck (15)
- 1What is kekule's structure?
- 2Why is kekule's structure wrong ?- It does not readily react with bromine (aq) as it needs a Catalyst
- The C-C bond lengths are the same lengths , so they must be symmetrical
- It is more thermodynamically stable as the enthalpy of hydrogenation is less exothermic than expected - 3What is the right structure of benzene ?π-delocalised ring of electrons above and below the plane of C-atoms
This increased Stability and low reactivity with Br
- 4What is Benzene's Empirical Formula and its Molecular Formula ?
- 5Properties of Benzene- planar hexagonal structure
-its colourless liquid with sweet odour
- highly flammable - 6Why doesn't benzene react readily with bromine?Electrons in the p-orbital are delocalised. This means that π-bond system is less dense.
As a result, Br is not attracted to them as it does not have an electron rich atom to undergo electrophilic addiction. - 7What is the overall reaction of nitration of benzene and what are its conditions?- It has concentrated H2SO4 catalyst
-undergoes reflux
- 8what is the mechanism of the nitration of benzene called?it undergoes Electrophilic Substitution
- 9What happens in the nitration of benzene?the catalyst has been regenerated.
- 10How is H2SO4 regenerated in the nitration of benzene?H+ + HSO4 - ¬> H2SO4
- 11What is the overall reaction of halogenation of benzene?
- 12What is the mechanism of halogenation of benzene?
- 13how is the electrophile , in halogenation of benzene, generated?FeCl3 + Cl2 ¬> FeCl4- + CL+
- 14how is FeCl3 regenerated? (halogenation of benzene)H+ + AlCl4 ¬> AlCl3 + HCl
- 15Name two types of uses that involves nitration of benzene?-Pharmaceuticals
- pesticides
-dyes
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- A-Level A2 chemistry (Module 1 - Ring, acids and amines) Flashcards on Benzene, created by Mary Doria on 31/08/2015.
- Created by
- Mary Doria · Aug 2015
- Updated
- Jun 14, 2016
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