Lucas reagent is ...... .

$PCC$ (Pyridinium chlorochromate) is a good reagent for which of the following transformations?

Compound $A$ and $C$ in the following reaction are
$CH_3CHO$ $\xrightarrow[(i) \, CH_3MgBr]{(ii) \, H_2O} A$ $\xrightarrow{H_2SO_4, \Delta} B$ $\xrightarrow{\text{Hydroboration-Oxidation}} C$

Match the reagents in Column-$I$ with the major products obtained from the reaction of $Butan-1-ol$ in Column-$II$.

Column-$I$ (Reagents)	Column-$II$ (Products)
$A$. $HCl + ZnCl_2$	$i$. $CH_3CH=CHCH_3$
$B$. $HBr$	$ii$. $CH_3CH_2CH_2CH_2Cl$
$C$. $SOCl_2$	$iii$. $CH_3CH_2CH_2CH_2Br$
$D$. $H_2SO_4, \Delta$	$iv$. $CH_3CH_2CH_2CH_2Cl$

Which of the following compounds does $NOT$ respond positively to the iodoform test?

Identify the product formed when $(R)-2-$butanol and $(S)-2-$butanol react with $(R,R)-$tartaric acid in an acidic medium.