A) +M effect
B) \[-I\]effect
C) \[+I\]effect
D) -M effect
Correct Answer: C
Solution :
\[\underset{'+I'\,(acetic\text{ }acid)}{\mathop{{{H}_{3}}C\to -\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,-O-H}}\,\] \[\underset{(formic\text{ }acid)}{\mathop{H-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,-O-H}}\,\] In acetic acid, methyl group release electron due to \[+I\] effect which decreases its acidic character whereas, formic acid does not contain any such type of group. Hence, formic acid is stronger acid than acetic acid.
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