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alcohols

alcohols. R-OH. Methanol. Benzyl alcohol. Glycerol. Ehanol. Aromatic. Aliphatic. Physical property. Ignition test:. Miscibility:. Methanol, ethanol and glycerol* miscible in H2O. They do not give any result with red and blue litmus paper

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alcohols

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  1. alcohols R-OH Methanol Benzyl alcohol Glycerol Ehanol Aromatic Aliphatic

  2. Physical property

  3. Ignition test:

  4. 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 , dilHcl and 30% NaOH • neutral

  5. 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.

  6. General test Oxidation test: 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

  7. Specific test

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

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

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