When compound $X$ is oxidised by acidified potassium dichromate,compound $Y$ is formed. Compound $Y$ on reduction with $LiAlH_4$ gives $X$. $X$ and $Y$ respectively are:

In the following reaction sequence,the major product $P$ is formed. Glycerol reacts completely with excess $P$ in the presence of an acid catalyst to form $Q$. Reaction of $Q$ with excess $NaOH$ followed by the treatment with $CaCl_2$ yields $Ca$-soap $R$,quantitatively. Starting with one mole of $Q$,the amount of $R$ produced in gram is. . . . [Given,atomic weight: $H=1, C=12, N=14, O=16, Na=23, Cl=35, Ca=40$ ]

Match the name of the acid from List-$I$ with the source from which it is derived.

$A$. Formic acid	$I$. Rancid butter
$B$. Acetic acid	$II$. Vinegar
$C$. Butyric acid	$III$. Red ants

Identify the correct decreasing order of boiling points for the following organic compounds.

Identify the final product $(D)$ in the following reaction sequence:
Phthalic anhydride $\xrightarrow{PCl_5} (A)$ $\xrightarrow{LiAlH_4} (B)$ $\xrightarrow{PCC} (C)$ $\xrightarrow{HO^-, \Delta} (D)$

The above conversion can be done by: