Reduction of the lactol $S$ with sodium borohydride $(NaBH_4)$ gives:

$A$ compound gives a positive test with $I_2/NaOH$ and is extracted from benzene by saturated $NaHSO_3$. It may be

Which of the following tests can be used to distinguish between $C_2H_5CHO$ and $(CH_3)_2CO$?

Compound $x$ having molecular formula $C_3H_6O$ is reduced by Red $P/HI$ to give compound $y$ $(C_3H_8)$. Since $x$ reduces Tollen's reagent,what is the possible structure of $x$?

What is the process of converting an oxime into an amide by rearrangement in the presence of a strong acid called?

Identify the reagents $X$ and $Y$ in the following reaction sequence:
$CH_3COCl \xrightarrow{X} CH_3CH_2OH$
$CH_3COCl \xrightarrow{Y} CH_3CHO$