The correct order of decreasing acidity of the following aliphatic...

The correct order of decreasing acidity of the following aliphatic acids is :-

Options

A $\begin{aligned} & \left(\mathrm{CH}_3\right)_3 \mathrm{CCOOH}\gt\left(\mathrm{CH}_3\right)_2 \mathrm{CHCOOH}\gt\mathrm{CH}_3 \mathrm{COOH} \\ & \gt\mathrm{HCOOH} \end{aligned}$
B $\begin{aligned} & \mathrm{CH}_3 \mathrm{COOH}\gt\left(\mathrm{CH}_3\right)_2 \mathrm{CHCOOH}\gt\left(\mathrm{CH}_3\right)_3 \mathrm{CCOOH} \\ & \gt\mathrm{HCOOH} \end{aligned}$
C $\begin{aligned} & \mathrm{HCOOH}\gt\mathrm{CH}_3 \mathrm{COOH}\gt\left(\mathrm{CH}_3\right)_2 \mathrm{CHCOOH} \\ & \gt\left(\mathrm{CH}_2\right)_3 \mathrm{CCOOH} \end{aligned}$
D $\begin{aligned} & \mathrm{HCOOH}\gt\left(\mathrm{CH}_3\right)_3 \mathrm{CCOOH}\gt\left(\mathrm{CH}_3\right)_2 \mathrm{CHCOOH} \\ & \gt\mathrm{CH}_3 \mathrm{COOH} \end{aligned}$

Correct answer

C. $\begin{aligned} & \mathrm{HCOOH}\gt\mathrm{CH}_3 \mathrm{COOH}\gt\left(\mathrm{CH}_3\right)_2 \mathrm{CHCOOH} \\ & \gt\left(\mathrm{CH}_2\right)_3 \mathrm{CCOOH} \end{aligned}$

Step-by-step solution

Acidic strength

\propto-I

effect

\propto \frac{1}{+

\mathrm{I}

\text{ effect }}

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