Let's analyze the given reaction sequence to identify the major product D.
The reaction sequence is as follows:
The first step involves the conversion of \(CH_3OH\) (methanol) to \(A\) using \(SOCl_2\). This results in \(CH_3Cl\) (methyl chloride), as \(SOCl_2\) converts alcohols to chlorides.
Next, \(A\) is converted to \(B\) using \(KCN\) in ethanolic solution. This is a nucleophilic substitution reaction, where chloride is replaced by cyanide, forming \(CH_3CN\) (methyl cyanide).
In the third step, \(B\) undergoes reduction using sodium amalgam (\(Na(Hg)\)) in ethanol to form \(C\), which is \(CH_3CH_2NH_2\) (ethylamine).
Finally, \(C\) is treated with \(NaNO_2\) and \(HCl\) followed by hydrolysis with water. This involves conversion of the amine to a diazonium salt, and upon hydrolysis, this forms \(CH_3CH_2OH\) (ethanol).
Thus, the major product \(D\) formed in the sequence is ethanol.
