Question

Arrange the following compounds in order of their increasing acid strength. 

• A. I $<$ II $<$ III $<$ IV
• B. IV $<$ III $<$ II $<$ I
• C. I $<$ IV $<$ II $<$ III
• D. II $<$ I $<$ III $<$ IV

Hint:

In dicarboxylic acids:
Closer COOH groups increase acidity
Oxalic acid type (adjacent COOH) is strongest
Longer chains reduce \(-I\) effect

Answer 1

The Correct Option is C