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 .
Which of the following compounds is resistant to nucleophilic attack by hydroxyl ion ?
Methylacetate
Acetonitrile
Acetamide
Diethyl ether
Ethyl amine reacts with nitrous acid to form :
C2H5OH
C2H5OH , N2 , H2O
C2H5N2+Cl-
C2H5NHOH , NH3
Aldehyde which is formed during photosynthesis of plants is :
methanal
acetaldehyde
propanal
phenylmethanal