The enol form of acetone,after treatment with $D_2O$,gives:

Three molecules of acetone in the presence of dry $HCl$ form:

Identify the reagents $(1-4)$ required for the transformations shown and arrange them in the correct order.
$(1)$ $LiAlH_4$
$(2)$ $OsO_4$
$(3)$ $NaIO_4$
$(4)$ $NaBH_4$

What are the products formed when an aldehyde $(R-CHO)$ is reacted with Tollen's reagent?

Which of the following compounds forms lactic acid upon the formation of its cyanohydrin followed by hydrolysis?

Match the reactions in Column $I$ with appropriate options in Column $II$.

Column $I$	Column $II$
$A$. $Ph-N_2Cl + Ph-OH \xrightarrow{NaOH/H_2O, 0^{\circ}C} Ph-N=N-Ph-OH$	$p$. Racemic mixture
$B$. $Pinacol \xrightarrow{H_2SO_4} Pinacolone$	$q$. Addition reaction
$C$. $Ph-CO-CH_3 \xrightarrow{1. LiAlH_4, 2. H_3O^+} Ph-CH(OH)-CH_3$	$r$. Substitution reaction
$D$. $4-chlorocyclohexanethiol \xrightarrow{Base} Thiacycloheptane$	$s$. Coupling reaction
	$t$. Carbocation intermediate