MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Organic ChemistryAldehydes and ketonesPrevious Year Questions

Aldehydes and ketones are differentiated by using (UP CPMT 2010)

A.NaOH/I2

B.NaHSO3

C.AgNO3/NH4OH✓ Correct

D.NH2.NH2

Explanation

With NaOH/I2, NaHSO3 and NH2.NH2(hydrazine), aldehydes as well as ketones can react while with AgNO3/NH4OH, (i.e. ammoniacal silver nitrate or Tollen’s reagent) only aldehydes react. Thus, AgNO3/NH4OH is used to distinguish aldehydes and ketones. 3 2 3 2 RCHO 2[Ag(NH ) ] 3OH RCOO 2Ag 4NH 2H O ->

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