JEE Main levelSingle correct optionDifficulty 2 of 3nm142
The number of carboxylic acid structural isomers of CX5HX10OX2 is
A4
B3
C5
D6
Answer: A
The acid is CX4HX9−COOH and the butyl group has 4 structural forms: pentanoic acid, 2-methylbutanoic acid, 3-methylbutanoic acid and 2,2-dimethylpropanoic acid. That makes 4.