Question

The acid(s) which do not contain –COOH groups is/are :
(a) palmitic acid
(b) lactic acid
(c) ethanoic acid
(d) picric acid and p-toluene sulphonic acid

Answer 1

picric acid and p_toluene sulphonic acid

Answer 2

Answer: Option (d) is the correct answer.

Explanation:

The functional group COOH corresponds to carboxylic acid.

Chemical formula of palmitic acid is $C_{16}H_{32}O_{2}$. This acid contains a carboxylic acid functional group at the terminal.

Chemical formula of lactic acid is $CH_{3}CH(OH)-COOH$. Hence, it also contains a carboxylic acid functional group.

Chemical formula of ethanoic acid is $CH_{3}COOH$. Hence, it also contains a carboxylic acid functional group.

Chemical formula of picric acid is $C_{6}H_{3}N_{3}O_{7}$. Hence, it does not contain any carboxylic acid functional group.

Chemical formula of p-toulene sulphonic acid is $C_{7}H_{8}O_{3}S$. Hence, it also it does not contain any carboxylic acid functional group.

Thus, we can conclude that the acids which do not contain COOH groups are picric acid and p-toluenesulphonic acid.