Q5 / 90 · JEE Main 2024 (08 Apr Shift 2) · Chemistry

The correct sequence of acidic strength of the following aliphatic acids in their decreasing order is: \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH}, \mathrm{CH}_3 \mathrm{COOH}, \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{COOH}, \mathrm{HCOOH}\)

  • A
    \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{COOH} > \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH} > \mathrm{CH}_3 \mathrm{COOH} > \mathrm{HCOOH}\)
  • B
    \(\mathrm{CH}_3 \mathrm{COOH} > \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH} > \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{COOH} > \mathrm{HCOOH}\)
  • Correct answer
    C
    \(\mathrm{HCOOH} > \mathrm{CH}_3 \mathrm{COOH} > \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH} > \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{COOH}\)
  • D
    \(\mathrm{HCOOH} > \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{COOH} > \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH} > \mathrm{CH}_3 \mathrm{COOH}\)

Solution

$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH}, \mathrm{CH}_3 \mathrm{COOH}, \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{COOH}$, $\mathrm{HCOOH}$ The correct order is : $\begin{aligned} & \mathrm{HCOOH}>\mathrm{CH}_3 \mathrm{COOH}>\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH}> \\ & \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{COOH}\end{aligned}$

Hence, the correct answer is option: 'C'.

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