A.K.GUPTAA.K.GUPTAP.G.T.CHEMISTRYKENDRIYA VIDYALAYA BALLYGUNGEKOLKATA-700019WESTBENGAL,INDIA
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Learning Objectives:Learning Objectives:at the end of the lesson the pupil shall-at the end of the lesson the pupil shall-
• Know Know the structure of the compound from its the structure of the compound from its common/IUPAC namecommon/IUPAC name
• Tollens reagent, Fehling's solution, ferric chloride, Tollens reagent, Fehling's solution, ferric chloride, Iodoform test, Lucas reagent etc.Iodoform test, Lucas reagent etc.
• Understand-Understand-(I) reducing & non reducing property of (I) reducing & non reducing property of aldehyde & ketone based on the structure of the aldehyde & ketone based on the structure of the functional group.functional group.
• Difference in reactivity of 1Difference in reactivity of 1ºº,2,2ºº,3,3ºº alcohols towards alcohols towards nucleophilic reactions.nucleophilic reactions.
• Iodoform testIodoform test• Apply Apply the knowledge gained to distinguish various the knowledge gained to distinguish various
given compoundsgiven compounds• Develops Skill Develops Skill to perform experiment, draw conclusions to perform experiment, draw conclusions
predict ,the compound/functional group.predict ,the compound/functional group.2AKG/KVB/Distinguish
INSTRUCTIONAL AIDS USEDINSTRUCTIONAL AIDS USED• Power point presentation, computerPower point presentation, computer• Chalk & Black BoardChalk & Black Board• Chemicals, test tubes sprit lamps etc Chemicals, test tubes sprit lamps etc
for demonstrationfor demonstration• Work sheetsWork sheetsetcetc
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Write the structure of the following Write the structure of the following compoundscompounds
Methanol Formaldehyde Benzophenone
Ethanol Acetaldehyde Pentan-2-one
Propan-1-ol Acetone Pentan-3-one
Propan-2-ol Benzaldehyde t-Butyl alcohol
Phenol Acetophenone Sec-Butyl alcohol
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What is ?
1 Lucas Reagent ZnCl2 + Conc HCl
2 Tollens Reagent Ammoniacal solution of Silver nitrate .[Ag(NH3)2]OH
3 Fehling Solution-A Aq soln of CuSO4
4 Fehling Solution-B Alkaline soln of Rochelle salt(sod pot tartarate)
5 Iodoform Test
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IODOFORM TEST
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Compounds having O OH ║ │ R─C-CH3 Or R ─C –CH3
│ H Structure on reaction with mixture of NaOH & I2 give
yellow coloured ppt of iodoform (CHI3)
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Tollens Test For Aldehydes
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Test For Phenolic –OH Group
Sample of Phenol + Neutral FeCl3 soln Violet colouration
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Test for 1º,2º,3º Alcohol
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Test Observation3º Alcohol + Lucas Reagent
ZnCl2 + Conc HClTurbidity appears immediately
2º Alcohol -do- Turbidity appears after some time
1º Alcohol -do- Turbidity does not appear
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TestTest ObservationObservation InferenceInferenceAcetaldehyde
Benzaldehyde
Write the test to distinguish between Acetaldehyde & Benzaldehyde
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TestTest ObservationObservation InferenceInferencePropanone
Propan-2-ol
Write the test to distinguish between Propanone & Propan-2-ol
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TestTest ObservationObservation InferenceInferenceMethanol
Ethanol
Write the test to distinguish between Ethanol & Methanol
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TestTest ObservationObservation InferenceInferenceAcetophenone
Benzophenone
Write the test to distinguish between Acetophenone & Benzophenone
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TestTest ObservationObservation InferenceInferenceEthanal
Propanal
Write the test to distinguish between Ethanal & Propanal
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TestTest ObservationObservation InferenceInferenceBenzaldehyde
Acetophenone
Write the test to distinguish between Benzaldehyde & Acetophenone
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TestTest ObservationObservation InferenceInferencePropanone
Propanal
Write the test to distinguish between Propanone & Propanal
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TestTest ObservationObservation InferenceInferencePenta-2-one
Pentan-3-one
Write the test to distinguish between Penta-2-one & Pentan-3-one
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TestTest ObservationObservation InferenceInference1-Propanol
2-Propanol
Write the test to distinguish between 1-Propanol & 2-Propanol
REFERNCEREFERNCE• Learning to teach –by Linda Shalaway
(scholastic professional books )• Starko, A.J. Creativity in the Classroom.
White Plains, N.Y;Publishers,1995• Modern’s ABC of Chemistry – Dr.S.P.Jauhar;
Modern Publication.• http://www.classroom.net• http://gsn.org• http://scholastic.com/Instructor
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