Absolute alcohol is prepared by :
vacuum distillation
azeotropic distillation
steam distillation
None of the above
B.
azeotropic distillation
Absolute alcohol is 100 % pure ethanol .The fractional distillation of aqueous solution of ethanol gives a constant boiling azeotropic mixture which contains 95% ethanol .To get 100% ethanol , a small amount of benzene is added with azeotropic mixture and then distilled .It is called azeotropic distillation .
Ethanol shows intermolecular H-bonding .Which of the following property is affected by H-bonding ?
Volatility
Boiling point
Solubility
All of these
Salicylic acid can be easily prepared by reaction between
phenol and CO2
benzoic acid and H2O2
benzene diazonium chloride and CO2
phenol and formic acid.
Reaction of aniline with HNO2 followed by treatment of dilute acid gives
C6H5NHOH
C6H5OH
C6H5NHNH2
C6H6