(A) Acid strength is inversely proportional to the $pK_a$ value. Lower $pK_a$ indicates higher acid strength. The given compounds are: $(I)$ Propiolic

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(A) Acid strength is inversely proportional to the $pK_a$ value. Lower $pK_a$ indicates higher acid strength. The given compounds are: $(I)$ Propiolic acid $(pK_a = 1.86)$ $(II)$ Acrylic acid $(pK_a = 4.3)$ $(III)$ $p$-Methoxybenzoic acid $(pK_a = 4.5)$ $(IV)$ Propanoic acid $(pK_a = 4.88)$ Comparing the $pK_a$ values: $1.86 Therefore,the order of acid strength is $I > II > III > IV$.

Class 12 Chemistry 8-2.Carboxylic acids and Their derivative Mix Examples-Carboxylic acids and Their derivative

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The correct order of acid strength of the following carboxylic acids is $-$

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A
$I > II > III > IV$
B
$III > II > I > IV$
C
$II > I > IV > III$
D
$I > III > II > IV$

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8-2.Carboxylic acids and Their derivative

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Mix Examples-Carboxylic acids and Their derivative

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Match the reactions given in Column-$I$ with their names in Column-$II$.

Column-$I$ (Reaction) Column-$II$ (Name)

$A$. $RCH_2COOH \rightarrow[H_2O]{X_2/P} RCH(X)COOH$ $i$. Decarboxylation

$B$. $RCOONa \rightarrow[NaOH, CaO, \Delta]{\text{soda lime}} RH$ $ii$. Grignard reaction

$C$. $RCOOH + R'OH \leftrightarrow{H^{+}} RCOOR' + H_2O$ $iii$. Hell-Volhard-Zelinsky reaction

$D$. $RMgX + R'CHO \rightarrow{H_3O^{+}} RCH(OH)R'$ $iv$. Esterification

Column-$I$ (Reaction)	Column-$II$ (Name)
$A$. $RCH_2COOH \rightarrow[H_2O]{X_2/P} RCH(X)COOH$	$i$. Decarboxylation
$B$. $RCOONa \rightarrow[NaOH, CaO, \Delta]{\text{soda lime}} RH$	$ii$. Grignard reaction
$C$. $RCOOH + R'OH \leftrightarrow{H^{+}} RCOOR' + H_2O$	$iii$. Hell-Volhard-Zelinsky reaction
$D$. $RMgX + R'CHO \rightarrow{H_3O^{+}} RCH(OH)R'$	$iv$. Esterification