question_answer

Which is correct statement?

A)  o-nitrobenzoic acid is stronger than 3, 5 dinitrobenzoic acid in \[{{H}_{2}}O\]

B)  Branched carboxylic acids are more acidic than unbranched acids

C)    is stronger acid than

D)  Butanoic acid is stronger acid than succinic acid

Correct Answer: A

Solution :

[a] o-nitrobenzoic acid is the strongest acid among all the nitrobenzoic acids due to ortho effect and stabilization of carboxylate ion by nitro group. [b] Branched carboxylic acids are less acidic than unbranched acids due to +\[I\]-effect of alkyl groups. [c] o-hydroxybenzoic acid is stronger acid than o-methoxybenzoic acid due to stabilization of carboxylate ion by H-bonding. [d] Succinic acid is stronger acid than butanoic acid. This is due to -I-effect of one carboxyl group on the other end.