In the following transformation,reagents $1$ and $2$ are:

  • A
    $H_2SO_4$; alk. $KMnO_4$
  • B
    $AlCl_3$; $I_2 / NaOH$
  • C
    $H_3PO_4$; $CHCl_3 / KOH$
  • D
    $KOH$; $CHCl_3 / KOH$

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Among the following compounds,the most acidic is

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What is the decreasing order of acidic strength for the following acids?
$[I]$ Methanoic acid
$[II]$ Ethanoic acid
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$A$ is a high molecular weight phenol and $B$ is an aromatic carboxylic acid. Which of the following would you use to separate a mixture of $A$ and $B$?

Select the acid with the highest $K_a$ (i.e.,lowest $pK_a$).

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