Which of the following carboxylic acids will undergo decarboxylation most easily?

  • A
    $C_6H_5-CO-CH_2-COOH$
  • B
    $C_6H_5-CO-COOH$
  • C
    $C_6H_5-CH(OH)-COOH$
  • D
    $C_6H_5-CH(NH_2)-COOH$

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Which of the following does not give Claisen condensation reaction?

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The decreasing order of the rate of alkaline hydrolysis for the following esters is:
$I: C_6H_5COOC_2H_5$
$II: p-Cl-C_6H_4COOC_2H_5$
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$IV: p-CH_3O-C_6H_4COOC_2H_5$

In the esterification of a carboxylic acid,the other reagent used is:

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