alcohols R-OH Methanol Ehanol Aliphatic Glycerol Benzyl alcohol Aromatic Physical property methanol state True liquid mobily ethanol True liquid mobily glycerol True liquid viscous Benzyl alc. True liquid oily color colorless odour alcoholic Odourless Bitter almond Ignition test: methanol inflammability luminous smoky Apperance change Color change Odor change residue ethanol glecerol inflammable Non luminous No smoky volatilization No change No change No residue Benzyl alc. luminous smoky 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 neutral : 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) gelatinous ppt. dirty white General test Oxidation test: What is this? Oxidizing agent K2Cr2O7 + dil H2SO4 +pumic stone +alcohols (distillate in beaker) ROH reflux distillation How to confirm? why RCHO RCOOH equations acids Specific test tests mehanol ethanol Iodoform test: meth. Or eth. +10% NaOH+ xss I2 No yellow ppt. Yellow ppt Wait and warm Esterfication test: (meth.+ salic. Or eth.+ acetic. ) +Conc. H2SO4→pour it after heat into beaker contain water Oil of winter green (vicks odor) with white ppt.(methyl salicylate) Bad apple odor (ribe apple) ethyl acetate) Heat until fussion Pink color Borax powder dissolve in water +phenol phthaline (ph.ph) +glycerol→ disappear pink color 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