An alcohol of formula $C_9H_{12}O$ reacts with $Na_2Cr_2O_7$ to form a compound having formula $C_9H_{10}O$. The original alcohol might be

$X + HCl$ $\xrightarrow[\text{Addition}]{\text{Anhy. } AlCl_3} C_2H_5Cl \xleftarrow[\text{Substitution}]{\text{Anhy. } ZnCl_2/HCl} Y$. The conversion of $Y$ to $X$ can be achieved by heating with .......... at .......... temperature.

Which product is not obtained when $\text{CH}_3\text{CH}_2\text{OH}$ reacts with $\text{H}_2\text{SO}_4$?

An oxygen-containing organic compound upon oxidation forms a carboxylic acid as the only organic product with its molecular mass higher by $14$ units. The organic compound is

When ethanol is treated with sulphuric acid at $413 \ K$,the reaction involved in it is:

$CH_3CH_2OH$ $\xrightarrow{Red \ P + I_2} (A)$ $\xrightarrow[Ether]{Mg} (B)$ $\xrightarrow{HCHO} (C)$ $\xrightarrow{H_2O} (D)$
The compound $(D)$ is