R-OH alcohols Benzyl alcohol Methanol Glycerol Ehanol Aromatic

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Presentation transcript:

R-OH alcohols Benzyl alcohol Methanol Glycerol Ehanol Aromatic Aliphatic

Physical property Benzyl alc. glycerol ethanol methanol state True liquid oily True liquid viscous True liquid mobily True liquid mobily state colorless color Bitter almond Odourless alcoholic odour

Ignition test: Benzyl alc. glecerol ethanol methanol inflammable inflammability luminous Non luminous smoky No smoky volatilization Apperance change No change Color change Odor change No residue residue

Miscibility: Methanol, ethanol and glycerol* miscible in H2O. They do not give any result with red and blue litmus paper neutral Benzyl alcohols immiscible in H2O , dil Hcl and 30% NaOH Glycerol need a lot of water

Conc. H2SO4* : no reaction with all except benzyl alc. Preliminary tests: soda lime : not done (why)?. 30%NaOH : no reaction. Fecl3 : no reaction. Conc. H2SO4* : no reaction with all except benzyl alc. Benzyl alc+ 4 dps Conc. H2SO4 (on wall) dirty white gelatinous ppt. Dry test tube

General test Oxidation test: (distillate in beaker) ROH RCHO RCOOH What is this? Oxidizing agent reflux K2Cr2O7 + dil H2SO4 +pumic stone +alcohols acids (distillate in beaker) ROH RCHO RCOOH distillation why How to confirm? equations

Specific test ethanol mehanol tests Wait and warm Yellow ppt No yellow ppt. Iodoform test: meth. Or eth. +10% NaOH+ xss I2 Heat until fussion Bad apple odor (ribe apple) ethyl acetate) Oil of winter green (vicks odor) with white ppt.(methyl salicylate) Esterfication test: (meth.+ salic. Or eth.+ acetic. ) +Conc. H2SO4→pour it after heat into beaker contain water

Borax test of glycerol Pink color Borax powder dissolve in water +phenol phthaline (ph.ph) +glycerol→ disappear pink color Conc. H2SO4 of benzyl alcohol Dirty white gelatinous ppt.

IR O-H Broad streching band at 3500-3200 cm-1 C-H aromatic above 3000cm-1 C-H aliphatic below 3000cm-1