Product $(P)$ is

In esterification,the reactivity of alcohols is:

The reaction shown below is an example of:
$CH_2=CH-COOCH_3 + CH_3CH_2CH_2OH \xrightarrow{\text{Conc. } HCl} CH_2=CH-COOCH_2CH_2CH_3 + CH_3OH$

Which of the following gives the iodoform test?

Match the reactants given in Column-$I$ with the products formed in Column-$II$.

Column-$I$ (Reactants)	Column-$II$ (Products)
$A$. $ROH + SOCl_2$	$i$. $RBr + NaHSO_4 + H_2O$
$B$. $ROH + PCl_5$	$ii$. $3RX + H_3PO_3$
$C$. $3ROH + PX_3$	$iii$. $RCl + SO_2 + HCl$
$D$. $ROH + NaBr + H_2SO_4$	$iv$. $RCl + POCl_3 + HCl$

An unknown compound $D$ is first oxidized to an aldehyde and then to acetic acid by a dilute solution of $K_2Cr_2O_7$ and $H_2SO_4$. The unknown compound $D$ is: