F324 2

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Author:
JustinL
ID:
267214
Filename:
F324 2
Updated:
2014-03-23 15:25:05
Tags:
Chemistry
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Description:
F324 OCR A
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  1. What is the equation for the formation of the Nitrous acid in situ (in the reaction) in the coupling reaction of Azo Dyes?
    NaNO2 + HCl  NaCl + HNO2
  2. Describe the bonding in Benzene.
    • The p-orbitals of all six carbon atoms overlap to create -bonds  above and below the ring.
    • Electrons are delocalised.
    • Ring is planar.
    • C-C bonds equal length.
    • Bond angles are all 120o

  3. How do Halogen carriers make the electrophile stronger?
    Accepts a lone pair of electrons from the electrophile.
  4. What is the mechanism for electrophillic addition in alkenes?
  5. What is the reaction in the first step of the generation of NO2+ ( an electrophile ) ?
    • HNO+ H2SO4 → H2NO3+ HSO4-
  6. What is the reaction in the second step of the generation of NO2( an electrophile ) ?
    H2NO3+→ NO2+ + H2O
  7. How is an aldehyde converted to a carboxylic acid?
    • The oxidising agent is acidified dichromate ions. ( Cr2O72-
    • Heated under reflux.
  8. How is a secondary alcohol oxidised into a ketone?
    • Under reflux
  9. What are the conditions for the nitration of benzene?
    • 50O C
    • Concentrated H2SO
    • Concentrated HNO3

  10. What does 'cis' mean when referring to isomerism?
    • Hydrogen atoms attached to the carbon atom are on the same side.
    • Molecule is bent at the double bond.
  11. What does 'trans' mean when referring to isomerism?
    • Hydrogen atoms attached to the carbon atom are on different sides.
    • Molecule is straight through the double bond.
  12. What are the conditions for the formation of the Diazonium ion?
    Below 10oC
  13. What is the equation for the formation of the Diazonium ion?
    • Hcomes from HCl
  14. What is the equation for the coupling reaction between a Diazonium salt and a Phenol?
    • Reactants also NaOH
    • Products also NaCl H2
    • Alkali conditions provided by NaOH

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