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6. what three issues did kekule's model of benzene have?
- low reactivity, uneven carbon bond length, higher enthlapy
- low reactivity, uneven carbon bond length, lower enthlapy
- high reactivity, even carbon bond length, higher enthlapy
- high reactivity, uneven carbon bond length, higher enthlapy
- low reactivity, even carbon bond length, lower enthlapy
7. what are the key structural features of the delocalised model of benzene?
- trigonal planar 100 angle, pi bond causing a delocalised ring making it very stable
- trigonal planar 100 angle, pi bond causing a localised ring making it very unstable
- trigonal planar 120 angle, pi bond causing a delocalised ring making it very unstable
- trigonal planar 120 angle, pi bond causing a delocalised ring making it very stable
- trigonal planar 120 angle, pi bond causing a localised ring making it very unstable
8. which are examples of halogen carriers?
- KBr3, SiBr3, AlCl3
- FeBr3, AlBr3, AlCl3
- KBr3, AlBr3, LiCl3
- FeBr3, AlBr3, KCl3
9. what conditions are needed for the nitration of benzene?
- HNaOH, 100 degrees celcius
- NaOH, 50 degrees celcius
- H2SO4, 50 degrees celcius
- H2SO4, 100 degrees celcius
10. what is the general mechanism for the electrophillic substitution of benzene?
- curley arrow from ring to E+. unstabe intermediate-H and E bonded. curley arrow from H to -ve ring. E bonded to benzene, and H+ ion
- curley arrow from ring to E+. unstabe intermediate-H and E bonded. curley arrow from H to +ve ring. E bonded to benzene, and H+ ion
- curley arrow from E+ to ring. unstabe intermediate-H and E bonded. curley arrow from -ve ring to H . E bonded to benzene, and H+ ion
11. state why phenol is more reactive.
- Oxygen donates one electron to delocalised ring making it more negative and less electron dense, able to induce a dipole.
- Oxygen donates lone pair to delocalised ring making it more negative and electron dense, able to induce a dipole.
- Oxygen donates lone pair to delocalised ring making it less negative and less electron dense, unable to induce a dipole.
- Oxygen donates lone pair to delocalised ring making it less negative and electron dense, able to induce a dipole.
- Oxygen donates one electron to delocalised ring making it more negative and electron dense, unable to induce a dipole.
12. phenol can be used for antiseptics and paint. true or false?
13. when phenol is reacted with bromine water one Br bonds with phenol to produce bromophenol and hydrogen bromide. true or false?
14. what is formed when phenol reacts with sodium hydroxide-NaOH and sodium-Na?
- NaOH- sodium phenoxide and hydrogen gas Na- sodium phenoxide and water
- NaOH- sodium phenoxide and water Na- sodium phenoxide and hydrogen gas
- NaOH- sodium phenoxide and water Na- sodium phenoxide and hydrogen liquid
