The $pK_a$ values of four carboxylic acids are $4.76, 4.19, 0.23$ and $3.41$ respectively. The $pK_a$ value of the strongest carboxylic acid among them is

Which of the following compounds will $NOT$ produce acetamide upon reaction with ammonia?

The product of the reaction is:

Which of the following is the most reactive compound toward a nucleophile?

Arrange the products $I$,$II$,$III$ from the following reactions in decreasing order of their acid strength.
$A) \text{Propylbenzene} \xrightarrow[\text{ (ii) } H_3O^{+}]{\text{ (i) } KMnO_4 / OH^{-}} I$
$B) CH_3COOH \xrightarrow[\text{ (ii) } H_2O]{\text{ (i) } Br_2 / \text{red } P} II$
$C) \text{Bromobenzene}$ $\xrightarrow[\substack{\text{ (ii) } CO_2 / \text{dry ether} \\ \text{ (iii) } H_3O^{+}}]{\text{ (i) } Mg / \text{dry ether}} III$

$R-COOH \xrightarrow{\text{Reagent}} R-CH_2-OH$
The suitable reagent for the above conversion is: