ALCOHOLS. MethanolEthanol GlycerolBenzyl alcohol AliphaticAromatic.

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Presentation transcript:

ALCOHOLS

MethanolEthanol GlycerolBenzyl alcohol AliphaticAromatic

Methanol MethanolEthanol Glycerol Glycerol Benzyl alcohol Physical properties: State Color Odor Inflammability Change in appearance Change in odor Residue Comment Liquid, mobily, trueLiquid, viscous, trueLiquid, oily, true Colorless Alcoholic odor Characteristic odor Ignition test: Inflammable, non luminous, non smoky Inflammable, luminous, smoky Volatilization No change No residue The compounds are aliphatic The compound is aromatic Odorless

Acid– base properties: [Solubility or Miscibility] MethanolEthanolGlycerolBenzyl alcohol H 2 O L.P. Dil. HCl 10% NaOH Comment: Miscible in H 2 O No change All the compounds are neutral Immiscible

Preliminary test: Methanol EthanolGlycerolBenzyl alcohol Soda lime On cold: On hot: On hot: 30% NaOH On cold: On cold: On hot: On hot: FeCl 3 On cold: On cold: On hot: On hot: Conc. H 2 SO 4 On cold: On cold: On hot: On hot: Not done (only for solid) No reaction in all Benzyl alcohol drops Conc. H 2 SO 4 (on the wall) Dirty white gleatinous ppt Not done

General test: Oxidation test: Methanol OX. Formaldehyde OX. Formic acid Ethanol OX. Acetaldehyde OX. Acetic acid Benzyl alcohol OX. Benzaldehyde OX. Benzoic acid

MethanolEthanol Specific test: 1.Iodoform test Alcohol + 10% NaOH + xss I 2 No yellow ppt Yellow ppt

MethanolEthanol Specific test: 2. Esterification test

Specific test: 3. Borax test for glycerol Borax + H 2 O (to dissolve it) + 2 drops ph.ph. + glycerol Disappearance of pink color (( glycerol borate)) very strong acid 4. Conc. H 2 SO 4 test for benzyl alcohol Benzyl alcohol + Conc. H 2 SO 4 Dirty white gelatinous pptIRLocationComment 3500 – 3200 cm -1 OH functional gp streatching band < 3000 cm -1 CH aliphatic streatching band > 3000 cm -1 CH aromatic streatching band