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1-Propanol and 2- propanol can be distin...

1-Propanol and 2- propanol can be distinguished by:

A

a.Oxidation with alkaline `KMnO_(4)` followed by reaction with Fehiling's solution.

B

b.Oxidation with acidic dichromate followed by reaction with Fehling's solution

C

c.Oxidation by heating with copper followed by reaction with Fehling's solution.

D

d.Oxidation with concentrated `H_(2)SO_(4)` follwed by reaction with Fehling's solution.

Text Solution

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The correct Answer is:
To distinguish between 1-Propanol and 2-Propanol, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Compounds**: - 1-Propanol (CH3CH2CH2OH) is a primary alcohol. - 2-Propanol (CH3CHOHCH3) is a secondary alcohol. 2. **Choose the Oxidizing Method**: - We will use heating with copper (Cu) as the oxidizing agent at a temperature of 300 degrees Celsius. 3. **Oxidation of 1-Propanol**: - When 1-Propanol is heated with copper, it gets oxidized to form Propanal (CH3CH2CHO), which is an aldehyde. - The reaction can be summarized as: \[ \text{CH}_3\text{CH}_2\text{CH}_2\text{OH} \xrightarrow{\text{Cu, 300°C}} \text{CH}_3\text{CH}_2\text{CHO} \] 4. **Reaction with Fehling's Solution**: - The resulting Propanal can then be reacted with Fehling's solution. - Fehling's solution contains copper(II) ions, which are reduced to copper(I) oxide (Cu2O), forming a red precipitate. - The reaction is: \[ \text{CH}_3\text{CH}_2\text{CHO} + \text{Fehling's solution} \rightarrow \text{Cu}_2\text{O (red precipitate)} + \text{other products} \] 5. **Oxidation of 2-Propanol**: - When 2-Propanol is heated with copper, it gets oxidized to form Acetone (CH3COCH3), which is a ketone. - The reaction can be summarized as: \[ \text{CH}_3\text{CHOHCH}_3 \xrightarrow{\text{Cu, 300°C}} \text{CH}_3\text{COCH}_3 \] 6. **Reaction with Fehling's Solution**: - The resulting Acetone does not react with Fehling's solution, meaning no red precipitate is formed. - Therefore: \[ \text{CH}_3\text{COCH}_3 + \text{Fehling's solution} \rightarrow \text{no reaction} \] 7. **Conclusion**: - By comparing the results, we can distinguish between 1-Propanol and 2-Propanol: - 1-Propanol gives a red precipitate with Fehling's solution. - 2-Propanol does not give any reaction with Fehling's solution. ### Final Answer: 1-Propanol and 2-Propanol can be distinguished by oxidation with copper followed by reaction with Fehling's solution. 1-Propanol gives a red precipitate, while 2-Propanol does not.

To distinguish between 1-Propanol and 2-Propanol, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Compounds**: - 1-Propanol (CH3CH2CH2OH) is a primary alcohol. - 2-Propanol (CH3CHOHCH3) is a secondary alcohol. ...
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Knowledge Check

  • 1-propanol and 2-propanol can be best distinguished by :

    A
    oxidation with alkaline `KMnO_(4)` followed by reaction with Fehling's solution
    B
    oxidation with acidic dichromate followed by reaction with Fehling's solution
    C
    oxidation by heating with copper followed by reaction with Fehling's solution
    D
    oxidation with conc. `H_(2)SO_(4)` followed by reaction with Fehling's solution
  • Phenol and cyclohexanol can be distinguished by using :

    A
    `FeCl_(3)`
    B
    Na
    C
    `PCl_(3)`
    D
    `CH_(3)COCl`
  • H-COOH and H-CHO can be distinguished by :

    A
    Tollen's reagent
    B
    Fehling's solution
    C
    `NaHCO_3` solution
    D
    `HgCl_2` solution
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