Explain in brief
Q. Which of the following is the most acidic?
(1) HCOOH
(2) $C H_{3} C O O H$
(3) $C H_{3} C H_{2} C O O H$
(4) $C H_{3} C H_{2} C H_{2} C O O H$

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Solution

Dear student,
As the length of alkyl group increases the +I effect increases . Due to increase in +I effect the acidic hydrogen will be more strongly bonded. So it will be difficult to loose H⁺. So HCOOH will be most acidic as it will have least +I effect and weakest bonded hydrogen which can be lost easily.
Hence the answer is (1) i.e. HCOOH.
Regards

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