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Carboxylic Acid & Derivatives Test - 14

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Carboxylic Acid & Derivatives Test - 14
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  • Question 1
    1 / -0

    Reaction of ethyl acetate with excess of CH3MgI followed by hydrolysis gives

    Solution

     

  • Question 2
    1 / -0

    The group present in waxes are :

    Solution

    Waxes are the esters of long chain fatty acids with long chain alcohols e.g., bee wax is an ester of myricyl alcohol and palmitic acid and is called myricyl palmitate (C15​H31​COOC30​H61​)

     

  • Question 3
    1 / -0

    Rate of the reaction,

    is fastest when Z is:

    Solution

    Reactivity order for acid derivatives due to better leaving group is

    RCOCl > (RCO)2O > RCOOR > RCONH2

     

  • Question 4
    1 / -0

    Lactic acid on oxidation with Fentons reagent gives main product:

    Solution

    Lactic acid on oxidation with Fentons reagent pyruvic acid. In this reaction, OH group is oxidized to carbonyl group.

     

  • Question 5
    1 / -0

    Among the following acids which has the lowest pka ​ value?

    Solution

    Lowest pka​→ Highest ka​→ High acididty.

    As R increases, acidity decreases in carboxylic acid due to increase in electron density on O−H bond.

    Where, R is length of alkyl chain.

    So, HCOOH is more acidic and least value of pka

    ​

  • Question 6
    1 / -0

    Toluene is oxidised to benzoic acid by 

    Solution

    When toluene is refluxed with alkaline KMnO4​ solution, it is oxidised to benzoic acid. The acid is usually obtained in solution as its salt due to the alkaline nature of the reaction mixture. 

    K2​Cr2​O7​ to carboxylic acids and ketones respectively. The oxidation is physically observed by the change in color upon reduction of Cr+6 (yellow) to Cr3+(blue).

     

  • Question 7
    1 / -0

    Which of the following reactions gives violet colur with neutral ferric chloride?

    Solution

    Salicylic acid contains -OH group hence gives violet colour with neutral FeCl3, which is a characteristic test for phenol

     

  • Question 8
    1 / -0

    Benzoic acid gives benzene on being heated with ′X′ and phenol gives benzene on being heated with ′Y′. Therefore ′X′ and ′Y′ are respectively.

    Solution

     

  • Question 9
    1 / -0

    What is Z in the following sequence of reactions?

    Solution

     

  • Question 10
    1 / -0

    Which compound will give brisk effervescence of CO2​ on treatment with NaHCO3​ ?

    Solution

    Only stronger acids like acetic acid give brisk effervescence on reacting with Na2​CO3​

     

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