| Formic acid (I) |
| Acetic acid (II) |
| Chloro acetic acid (III) |
| Trichloro acetic acid (IV) |
A) IV, III, II, I
B) II, I, IV, III
C) II, I, III, IV
D) I, II, IV, III
Correct Answer: C
Solution :
The acidity increases on decreasing the value of\[p{{K}_{a}}\]. \[\underset{acetic\text{ }acid}{\mathop{C{{H}_{3}}COOH}}\,<\underset{formic\text{ }acid}{\mathop{HCOOH}}\,<\underset{chloroacetic\text{ }acid}{\mathop{ClC{{H}_{2}}COOH}}\,\] \[<\underset{\begin{smallmatrix} trichloroacetic \\ \,\,\,\,\,\,\,\,\,\,\,acid \end{smallmatrix}}{\mathop{C{{l}_{3}}C.COOH}}\,\] \[\xrightarrow[Increasing\text{ }order\text{ }of\text{ }acidic\text{ }strength]{{}}\] or Decreasing order of\[p{{K}_{a}}\].
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