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$Cl_2 + 2e^-\to 2CI^{\Theta }$ ; $E^o = 1.36\, V$
$Mn^{+3} + e^-\to Mn^{+2}$ ; $E^o = 1.50\, V$
$Fe^{+3} + e^-\to Fe^{+2}$ ; $E^o = 0.77\, V$
Which of the following is a correct statement
Reason $(R)$ : Oxygen forms $\mathrm{p} \pi-\mathrm{p} \pi$ multiple bonds with itself and other elements having small size and high electronegativity like $\mathrm{C}, \mathrm{N}$, which is not possible for sulphur.
In the light of the above statements, choose the most appropriate answer from the options given below :
The correct statement ($s$) about $P, Q, R$, and $S$ is (are)
($A$) $P$ and $Q$ are monomers of polymers dacron and glyptal, respectively.
($B$) $P, Q$, and $R$ are dicarboxylic acids.
($C$) Compounds $Q$ and $R$ are the same.
($D$) $R$ does not undergo aldol condensation and $S$ does not undergo Cannizzaro reaction.