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Carboxylic Acid & Derivatives Test - 16

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Carboxylic Acid & Derivatives Test - 16
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  • Question 1
    1 / -0

    The correct order of increasing acid stregth of the compounds

    (A) CH3CO2H

    (B) MeOCH2CO2H

    (C) CF3CO2H

    (D) (Me)2 - CO2H

    Solution

    Electron withdrawing groups increase the acidic stregth whereas electron releasing groups decrease the acidic stregth of carboxylic acids. Hence order of acidic stregth of given compounds is as per option "c"

     

  • Question 2
    1 / -0

    From the following values of dissociation constant of four acids which value represents the strongest acid?

    Solution

    Larger the value of dissociation constant (Ka), stronger is the acid

     

  • Question 3
    1 / -0

    X is heated with soda lime and gives ethane. X is :

    Solution

    Sodium salt of any carboxylic acid with hot soda lime undergo decarboxylation to form alkane which has one carbon atom less than the parent molecule.

     

  • Question 4
    1 / -0

    A liquid was mixed with ethanol and a drop of concentrated H2SO4 was added. A compound with a fruity smell was formed. The liquid was

    Solution

    Since the compound formed has a fruity smell, it is an ester, thus the liquid to which ethanol and conc. H2SO4 are added must be an acid
    CH3COOH + C2H5OH → CH3COOC2H5 + H2O

     

  • Question 5
    1 / -0

    Acetic acid is obtained when:

    Solution

    On oxidation of Acetaldehyde with oxidizing agents such as K2​Cr2​O7​ or KMnO4​ gives acetic acid.

    Acetic acid is obtained when acetaldehyde is oxidized with potassium dichromate and sulphuric acid.

     

  • Question 6
    1 / -0

    In a reaction involving ring substitution of C6H5Y, the major product is meta isomer. The group Y can be

    Solution

    -COOH is m-directing and electron withdrawing group

     

  • Question 7
    1 / -0

    Which of the following acids on heating loses a molecule of H2O to form an α, β-unsaturated acid?

    Solution

    β Hydroxy carboxylic acid readily loses a molecule of water on heating to yield α, β-unsaturated acid

     

  • Question 8
    1 / -0

    Vinegar obtained from sugarcane has :

    Solution

     

  • Question 9
    1 / -0

    Identify the product C in the series

    Solution

     

  • Question 10
    1 / -0

    R−CH2​−CH2​OH can be converted to R−CH2​CH2​COOH. The correct sequence of reagents is:

    Solution

    R−CH2​−CH2​OH can be converted to R−CH2​CH2​COOH. 

    The correct sequence of reagents is PBr3​,KCN,H3​O+.

    Alcohol is converted to alkyl bromide. Br atom is then substituted with cyano group. Acid hydrolysis of cyano group gives final product (carboxylic acid).

     

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