In this reaction,product $X$ is
$CH_3-CH_2-Br$ $\xrightarrow{alc. KCN} CH_3CH_2CN$ $\xrightarrow{HOH} X$

Identify an appropriate reagent for the conversion of $1^o$ Alcohol to carboxylic acid:-

How is formic acid prepared?

In a reaction,$(CH_3)_2CHMgBr + CO_2$ $\xrightarrow[\text{dry ether}]{} A$ $\xrightarrow[dil. HCl]{H_2O} B$. Find the product '$B$' of the above reaction.

Write a method of preparation for carboxylic acid from the oxidation of primary alcohol and aldehyde compounds.

Compare the two methods shown for the preparation of carboxylic acids.
Method $1$: $RBr$ $\xrightarrow[diethyl \ ether]{Mg} RMgBr$ $\xrightarrow[2. \ H_3O^{+}]{1. \ CO_2} RCO_2H$
Method $2$: $RBr$ $\xrightarrow{NaCN} RCN$ $\xrightarrow[heat]{H_2O, HCl} RCO_2H$
Which one of the following statements correctly describes this conversion for the given substrate ($1$-bromoadamantane)?