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(A) Let us analyze the structures of the given compounds:$1$. Sulphanilic acid $(p-NH_2C_6H_4SO_3H)$: Contains a sulphonic acid group $(-SO_3H)$,not a

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(A) Let us analyze the structures of the given compounds:$1$. Sulphanilic acid $(p-NH_2C_6H_4SO_3H)$: Contains a sulphonic acid group $(-SO_3H)$,not a carboxylic acid group $(-COOH)$.$2$. Picric acid ($2,4,6-$trinitrophenol): Contains a phenolic hydroxyl group $(-OH)$ and nitro groups $(-NO_2)$,not a carboxylic acid group $(-COOH)$.$3$. Aspirin (Acetylsalicylic acid): Contains a carboxylic acid group $(-COOH)$ and an ester group.$4$. Ascorbic acid (Vitamin $C$): Contains hydroxyl groups and a cyclic ester (lactone),not a carboxylic acid group $(-COOH)$.Thus,only Aspirin contains the $-COOH$ group.The total number of such compounds is $1$.

The number of compounds given below which contain the $-COOH$ group is .... .
$A$. Sulphanilic acid
$B$. Picric acid
$C$. Aspirin
$D$. Ascorbic acid

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The number of compounds given below which contain the $-COOH$ group is .... .$A$. Sulphanilic acid$B$. Picric acid$C$. Aspirin$D$. Ascorbic acid