MASTERING ORGANIC CHEMISTRY By-- S.K.SINHA 1
1. Test of unsaturation
PRACTICAL ORGANIC CHEMISTRY
addition of H2,
1 1 mole H2
addition of Br2 \ CCl4 or Bromine water
*Phenolic compounds gives light yellow ppt with Br2 water.
*Aromatic amines gives ppt with Br2/H2O
Bayer's Reagent discharge the colour of dil, cold, alkaline KMnO4 to pink or brown.
Terminal alkynes gives red/brown ppt with Cu2Cl2/NH4OH due to Copperalkylide.
Terminal alkyne gives white ppt with tollens reagent Silver alkylide.
2. Test of OHgroup
evolves H2 gas with Na metal.
gives red soln. with ceric ammoniam nitrate.
gives ester with acetic anhydrides, acid chloride, acids.
gives halides with PCl5, PX3, anhy. ZnCl2 / conc. HCl or SOCl2.
lucas test (anhy. ZnCl2 / Conc. HCl)
3 Formation of turbidity immediate
2 Formation of turbidity within 5 minutes.
1 No turbidity appears
Victor Mayer Test
(a) Red soln. nitrolic acid salt 10
(iii) NaNO2 / conc. H2SO4
(b) blue soln. of Pseudonitrol 20
(c) No colour 3 alcohol
(a) 1 Alcohol aldehyde
(b) 2 Alcohol Ketone
(c) 3 Alcohol alkene
(3) Test of Phenolic group
soluble in NaOH Insoluble in NaHCO3 (Picric acid is only alcohol soluble in NaHCO3)
Phenol gives red colour with alc. FeCl3
Phenols undergoes acetylation & Methylation.
(4) Test of ether linkage
Ethers insoluble in H2O.
with HI gives alcohol and alkyl Iodide
with excess HI only alkyl Iodide
(5) Test of Carbonyl groups
Phenyl hydrazine &HCl brown crystalline compound of phenyl hydrazone.
2,4 DNPH (Brady's reagent) Red ppt (c)
Reduced to alkanes by
(i)Wolff = Kishner redu