So, only aldehyde (RCHO) giving iodoform reaction is acetaldehyde $\left( CH _3 CHO \right)$
Alcohols of the structure $CH _3 CH ( OH ) R$ give iodoform reaction, as, on oxidation, it is converted into $CH _3 COR$.
But other $2^{\circ}$ alcohols will not give this test.
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$\begin{array}{|l|l|l|l|} \hline & Column\,I & & Column\,II \\ & (Reduction\,process) & & (Charge\,required) \\ \hline (a) & 1\,mol\,of\,MnO_4^-\,to\,Mn^{2+} & (p) & 193000\,\,C \\ \hline (b) & 1\,\,mole\,of\,Cr_2O_7^{2-}\,to\,Cr^{3+} & (q) & 289500\,\,C \\ \hline (c) & 1\,\,mole\,of\,Sn^{4+}\,to\,Sn^{2+} & (r) & 482500\,\,C \\ \hline (d) & 1\,mole\,of\,Al^{3+}\,to\,Al & (s) & 579000\,\,C \\ \hline \end{array}$
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($1$) The compound $R$ is
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($2$) The compound $S$ is
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Give the answer or quetion ($1$) and ($2$)