1 / 14

Phenols

Phenols. Lab 4. Phenols. Phenols are compounds that have a hydroxyl group directly attached to a benzene ring Hydroxy benzene = phenol . P roperties . phenols are polar due to the ability to form hydrogen bond phenols are water soluble P henol can dissolve in NaoH

brigit
Télécharger la présentation

Phenols

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Phenols Lab 4

  2. Phenols • Phenols are compounds that have a hydroxyl group directly attached to a benzene ring • Hydroxy benzene = phenol

  3. Properties • phenols are polar due to the ability to form hydrogen bond • phenols are water soluble • Phenol can dissolve in NaoH • Phenolsare more acidic than alcoholsbut less acidic than Carboxylic acids.

  4. Uses & toxicity • Early uses for phenol was as an antiseptic. • Phenol is used as a starting material to make plastics, explosives such as picric acid, and drugs such as aspirin. • Toxic, harmful and corrosive • Skin burns

  5. Phenols Phenol Resorcinol Catechol

  6. Physical properties

  7. Chemical test

  8. General test • FeCL3 test : • Few mg of Phenols dissolve in water + 1-2 drop of FeCL3 • Results: • Phenol = violet color • Resorcinol = violet color • Catechol = Green color

  9. General test • FeCL3 test • Results: • Phenol Resorcinol Catechol violet color violet color Green color

  10. GENERAL TEST • Azo – dye formation test (( Diazotization test)) • drop aniline (red color) + dil.HCl (until dissolve) + NaNO2 (sod. Nitrite solution) = until faint pale yellow color - PUT IN ICE • Few phenol + 10% NaOH (until phenol dissolved) • Add (1) on (2) gradually

  11. GENERAL TEST • Result : • Phenol = ((Azo – dye formation))Orange – red color or ppt • Resorcinol = ((Azo – dye formation))Orange – red color or ppt • Catechol = No azo – dye form {Decomposition, dark purple color}

  12. GENERAL TEST • Azo – dye formation test (( Diazotization test)) Phenol Resorcinol ((Azo – dye formation))Orange – red color or ppt Catechol No azo – dye form {Decomposition, dark purple color}

  13. SPESIFIC TEST • Phthalein test : • Few mg of Phenol + phatalic anhydride + 4 drops con.H2SO4 cool = then pour it in beaker contain 20 ml of 10%NaOH

  14. SPESIFIC TEST • Phenol = Pink color • Resorcinol = Green fluorescence added water = fluorescence • Catechol = Blue color

More Related