Match the following:

$A$. Teflon	$I$. $SnCl_2$
$B$. Anionic polymerisation	$II$. $C_2F_4$
$C$. Cationic polymerisation	$III$. Bakelite
$D$. Thermosetting polymer	$IV$. Polystyrene
	$V$. $RLi$

The correct answer is:

Match the chemical substances in Column-$I$ with the type of polymers/type of bonds in Column-$II$.

Column-$I$	Column-$II$
$A$. Cellulose	$p$. Natural polymer
$B$. Nylon-$6,6$	$q$. Synthetic polymer
$C$. Protein	$r$. Amide linkage
$D$. Sucrose	$s$. Glycoside linkage

Assertion : $1, 3-$ Butadiene is the monomer for natural rubber.
Reason : Natural rubber is formed through anionic addition polymerization.

An organic compound $P$ with molecular formula $C_{9}H_{18}O_{2}$ decolorizes bromine water and also shows a positive iodoform test. $P$ on ozonolysis followed by treatment with $H_{2}O_{2}$ gives $Q$ and $R$. While compound $Q$ shows a positive iodoform test,compound $R$ does not. $Q$ and $R$ on oxidation with pyridinium chlorochromate $(PCC)$ followed by heating give $S$ and $T$,respectively. Both $S$ and $T$ show a positive iodoform test.
Complete copolymerization of $500$ moles of $Q$ and $500$ moles of $R$ gives one mole of a single acyclic copolymer $U$.
[Given,atomic mass: $H=1, C=12, O=16$ ]
$(1)$ Sum of the number of oxygen atoms in $S$ and $T$ is. . . . . .
$(2)$ The molecular weight of $U$ is
Give the answer for questions $(1)$ and $(2)$.

Which of the following has cross-links?

The bond energy of $C=C$ and $C-C$ at $298 \ K$ are $590 \ kJ \ mol^{-1}$ and $331 \ kJ \ mol^{-1}$ respectively. The enthalpy of polymerisation per mole of ethylene is $..... \ kJ$.